A murder in a Bulgarian neighborhood results in a challenging investigation when locals won't talk to police; Ruzek has a clash with a patrol officer.

The shocking murder of young boys affects Halstead; Crawford encourages Intelligence to use a new facial recognition software to help identify a suspect, but the plan backfires.

When Leslie Neulander's death is declared accidental, forensic investigators sound the alarm that it was no accident.

A suitcase filled with unidentified human remains unlocks a missing person's case that has gone unsolved for years; the forensic analysis of a nearly-destroyed cellphone found in the suitcase reveals a mysterious selfie.

When Lanell Barsock is found murdered, it seems obvious to all that her boyfriend did it; when the forensic evidence comes in, investigators are astonished to learn they've arrested the wrong person.

Brett and Mackey find their lives in peril; Casey and Brett tread in unfamiliar territory; Severide chases a memory while Kidd adeptly solves a firehouse problem; Ritter puts himself in harm's way during a harrowing call.

A mishap on the aerial ladder in the midst of a fire rescue leaves Mouch shaken and questioning his abilities; Kidd looks for support from Severide while Casey and Brett discuss their future.

While completing a task assigned by headquarters, Boden makes an unforeseen connection; Gallo is forced to make a surprise rescue of one of their own when the firehouse is called to the site of a construction explosion; Mouch reignites an old feud.

When Firehouse 51 is called to the scene of a dangerous blaze inside a 10-story storage unit, Herrmann and Cruz find themselves trapped inside a freight elevator with all communications cut off.

Gallo makes a split-second decision during a dangerous fire rescue, leaving Casey steaming that his direct orders weren't obeyed; Kidd feels a strain in her relationship with Severide; Brett and Mackey search for answers after some suspicious calls.

A fire at a homeless encampment leaves Severide and Casey searching for answers; Cruz is shaken up after a close call; Ritter lends a helping hand to a victim.

A call to a familiar location brings back mixed emotions for Severide; Herrmann heads out for a vacation; Casey is not thrilled with his replacement.

Brett and Mackey find their lives in peril; Casey and Brett tread in unfamiliar territory; Severide chases a memory while Kidd adeptly solves a firehouse problem; Ritter puts himself in harm's way during a harrowing call.

A mishap on the aerial ladder in the midst of a fire rescue leaves Mouch shaken and questioning his abilities; Kidd looks for support from Severide while Casey and Brett discuss their future.

While completing a task assigned by headquarters, Boden makes an unforeseen connection; Gallo is forced to make a surprise rescue of one of their own when the firehouse is called to the site of a construction explosion; Mouch reignites an old feud.

When Firehouse 51 is called to the scene of a dangerous blaze inside a 10-story storage unit, Herrmann and Cruz find themselves trapped inside a freight elevator with all communications cut off.

Gallo makes a split-second decision during a dangerous fire rescue, leaving Casey steaming that his direct orders weren't obeyed; Kidd feels a strain in her relationship with Severide; Brett and Mackey search for answers after some suspicious calls.

A fire at a homeless encampment leaves Severide and Casey searching for answers; Cruz is shaken up after a close call; Ritter lends a helping hand to a victim.

A call to a familiar location brings back mixed emotions for Severide; Herrmann heads out for a vacation; Casey is not thrilled with his replacement.

Brett and Mackey find their lives in peril; Casey and Brett tread in unfamiliar territory; Severide chases a memory while Kidd adeptly solves a firehouse problem; Ritter puts himself in harm's way during a harrowing call.

A mishap on the aerial ladder in the midst of a fire rescue leaves Mouch shaken and questioning his abilities; Kidd looks for support from Severide while Casey and Brett discuss their future.

While completing a task assigned by headquarters, Boden makes an unforeseen connection; Gallo is forced to make a surprise rescue of one of their own when the firehouse is called to the site of a construction explosion; Mouch reignites an old feud.

When Firehouse 51 is called to the scene of a dangerous blaze inside a 10-story storage unit, Herrmann and Cruz find themselves trapped inside a freight elevator with all communications cut off.

Gallo makes a split-second decision during a dangerous fire rescue, leaving Casey steaming that his direct orders weren't obeyed; Kidd feels a strain in her relationship with Severide; Brett and Mackey search for answers after some suspicious calls.

When Leslie Neulander's death is declared accidental, forensic investigators sound the alarm that it was no accident.

A suitcase filled with unidentified human remains unlocks a missing person's case that has gone unsolved for years; the forensic analysis of a nearly-destroyed cellphone found in the suitcase reveals a mysterious selfie.

A homeowner has high hopes for the renters who move in next door; then, his hopes are dashed, setting the stage for a shocking act of violence that threatens to claim many lives.

Homicide investigators are convinced an apparent murder-suicide was staged but the experienced CSI on the scene disagrees; only the instincts of the cops, coupled with an outside forensic expert's opinion, convince authorities who the real killer is.

The team rushes to save a woman when a disturbed man holds her hostage outside an office building.

A homeowner has high hopes for the renters who move in next door; then, his hopes are dashed, setting the stage for a shocking act of violence that threatens to claim many lives.

Homicide investigators are convinced an apparent murder-suicide was staged but the experienced CSI on the scene disagrees; only the instincts of the cops, coupled with an outside forensic expert's opinion, convince authorities who the real killer is.

The team rushes to save a woman when a disturbed man holds her hostage outside an office building.

A homeowner has high hopes for the renters who move in next door; then, his hopes are dashed, setting the stage for a shocking act of violence that threatens to claim many lives.

The team rushes to save a woman when a disturbed man holds her hostage outside an office building.

Homicide investigators are convinced an apparent murder-suicide was staged but the experienced CSI on the scene disagrees; only the instincts of the cops, coupled with an outside forensic expert's opinion, convince authorities who the real killer is.

Mouch, Gallo, Ritter and Mackey report for training; a nasty blow to the head brings Casey unimaginable pain.

A series of suspicious fires sends 51 on a search for the cause; Casey continues down a troubling path; Mouch is looking to make his long-awaited dream come true.

A new recruit with ties to the CFD tests Severide's patience; Violet receives a mysterious note that sends her and Brett on a hunt for the person who wrote it.

While Mouch makes an incredible save, all eyes are on a mystery man who helped save his neighbor; Casey worries about his future at the CFD.

A mysterious caller who is in danger relies on Kidd to help save her and her brother; the firehouse helps Cruz get ready for fatherhood.

A fire breaks out at a pet food factory, and Casey and Severide help the owner, Pete, get to the bottom of it; the annual garage sale takes place at 51 and everyone is on edge.

Tara debates whether the gang would be safer without her; but danger has followed them to Germany.

Mouch, Gallo, Ritter and Mackey report for training; a nasty blow to the head brings Casey unimaginable pain.

A series of suspicious fires sends 51 on a search for the cause; Casey continues down a troubling path; Mouch is looking to make his long-awaited dream come true.

A new recruit with ties to the CFD tests Severide's patience; Violet receives a mysterious note that sends her and Brett on a hunt for the person who wrote it.

While Mouch makes an incredible save, all eyes are on a mystery man who helped save his neighbor; Casey worries about his future at the CFD.

A mysterious caller who is in danger relies on Kidd to help save her and her brother; the firehouse helps Cruz get ready for fatherhood.

A fire breaks out at a pet food factory, and Casey and Severide help the owner, Pete, get to the bottom of it; the annual garage sale takes place at 51 and everyone is on edge.

Tara debates whether the gang would be safer without her; but danger has followed them to Germany.

Mouch, Gallo, Ritter and Mackey report for training; a nasty blow to the head brings Casey unimaginable pain.

A retiree buys a duplex and rents out half of it to a troubled family; with the help of his gun, he sends the abusive husband packing and becomes smitten with the wife left behind; the situation turns deadly when the husband returns.

Police struggle to identify the body of a woman found floating in the Indian River; with only a piece of nautical rope, a strip of duct tape and some plastic bags to go on, they use every forensic tool they have to catch her killer.

Sgt. Parker is forced to confront his feelings about his child when a desperate man at a hospital holds doctors at gunpoint until his dying daughter gets a new heart.

A retiree buys a duplex and rents out half of it to a troubled family; with the help of his gun, he sends the abusive husband packing and becomes smitten with the wife left behind; the situation turns deadly when the husband returns.

Police struggle to identify the body of a woman found floating in the Indian River; with only a piece of nautical rope, a strip of duct tape and some plastic bags to go on, they use every forensic tool they have to catch her killer.

Sgt. Parker is forced to confront his feelings about his child when a desperate man at a hospital holds doctors at gunpoint until his dying daughter gets a new heart.

A retiree buys a duplex and rents out half of it to a troubled family; with the help of his gun, he sends the abusive husband packing and becomes smitten with the wife left behind; the situation turns deadly when the husband returns.

Sgt. Parker is forced to confront his feelings about his child when a desperate man at a hospital holds doctors at gunpoint until his dying daughter gets a new heart.

Police struggle to identify the body of a woman found floating in the Indian River; with only a piece of nautical rope, a strip of duct tape and some plastic bags to go on, they use every forensic tool they have to catch her killer.

The staff adjusts to the new normal of the pandemic; Dr. Choi, Dr. Lanik and April fight on the front lines; Dr. Halstead and Hannah face a troubling reality; Dr. Charles tries to clear the air with his daughter following recent developments.

Goodwin announces a new ED Chief, and the choice doesn't make everyone happy; Dr. Manning takes a stand for her patient and finds herself dealing with the repercussions; Dr. Charles tends to family affairs.

Dr. Charles and April team up to take on a mysterious patient in the ED; Dr. Halstead is forced to make a life-or-death decision for one of his trial patients; Dr. Marcel is confronted by his past when a former acquaintance is brought into the ED.

Dr. Marcel and Dr. Manning lay everything on the line to assist a sick woman; Dr. Halstead faces an uphill battle in getting participants involved in his clinical trial; Dr. Choi clashes with a patient who demands absolute perfection of himself.

Dr. Halstead finds continued success in his trial; Dr. Charles' daughter, Anna, receives life-changing news; Noah finds himself in a situation not even April can fix.

Choi helps a patient with chronic pain find a solution; Halstead considers a new path; Charles and Anna bond over a scary situation.

Halstead runs into trouble when one of his trial patients falls ill; his own stress and symptoms have Choi struggling to get through the day.

The staff adjusts to the new normal of the pandemic; Dr. Choi, Dr. Lanik and April fight on the front lines; Dr. Halstead and Hannah face a troubling reality; Dr. Charles tries to clear the air with his daughter following recent developments.

Blackmailed and sidelined from investigating, Sherlock Holmes finds hope when a young woman arrives on his doorstep, potentially holding the key to solving the kidnapping of an ambassador's daughter.

Goodwin announces a new ED Chief, and the choice doesn't make everyone happy; Dr. Manning takes a stand for her patient and finds herself dealing with the repercussions; Dr. Charles tends to family affairs.

Dr. Charles and April team up to take on a mysterious patient in the ED; Dr. Halstead is forced to make a life-or-death decision for one of his trial patients; Dr. Marcel is confronted by his past when a former acquaintance is brought into the ED.

Dr. Marcel and Dr. Manning lay everything on the line to assist a sick woman; Dr. Halstead faces an uphill battle in getting participants involved in his clinical trial; Dr. Choi clashes with a patient who demands absolute perfection of himself.

Dr. Halstead finds continued success in his trial; Dr. Charles' daughter, Anna, receives life-changing news; Noah finds himself in a situation not even April can fix.

Choi helps a patient with chronic pain find a solution; Halstead considers a new path; Charles and Anna bond over a scary situation.

Halstead runs into trouble when one of his trial patients falls ill; his own stress and symptoms have Choi struggling to get through the day.

Blackmailed and sidelined from investigating, Sherlock Holmes finds hope when a young woman arrives on his doorstep, potentially holding the key to solving the kidnapping of an ambassador's daughter.

The staff adjusts to the new normal of the pandemic; Dr. Choi, Dr. Lanik and April fight on the front lines; Dr. Halstead and Hannah face a troubling reality; Dr. Charles tries to clear the air with his daughter following recent developments.

A family loves everything about their new home except the mockingbirds that perch and squawk in the backyard lemon tree; the family seeks to scare them off, igniting a feud with their neighbors that spins out of control until someone lies dead.

From tropical Hawaii to the frigid waters of Lake Ontario, experts reveal the clues nature leaves behind on a human corpse.

An innocent bystander creates complications for the team when he stumbles into the middle of a drug bust.

A family loves everything about their new home except the mockingbirds that perch and squawk in the backyard lemon tree; the family seeks to scare them off, igniting a feud with their neighbors that spins out of control until someone lies dead.

From tropical Hawaii to the frigid waters of Lake Ontario, experts reveal the clues nature leaves behind on a human corpse.

An innocent bystander creates complications for the team when he stumbles into the middle of a drug bust.

A family loves everything about their new home except the mockingbirds that perch and squawk in the backyard lemon tree; the family seeks to scare them off, igniting a feud with their neighbors that spins out of control until someone lies dead.

An innocent bystander creates complications for the team when he stumbles into the middle of a drug bust.

From tropical Hawaii to the frigid waters of Lake Ontario, experts reveal the clues nature leaves behind on a human corpse.

A massive tsunami hits the Santa Monica Pier; Buck fears the worst when Christopher goes missing.

The team races to save workers in a high-rise during a fire drill, car accident victims, and siblings fighting over a family heirloom; Buck gives Bobby surprising news; Eddie helps Christopher deal with the trauma caused by the tsunami.

The 118 races to help protesters at a slaughterhouse and a wife who finds herself trapped in a "rage room" with her husband's mistress; Athena takes action after Michael, May and Harry experience a traumatic traffic stop.

Athena and the 118 respond to bizarre emergency calls on Halloween, including a flock of crows terrorizing a field trip, an office employee having a close encounter with an eight-limbed creature and a ghost-like girl wandering a neighborhood.

When a murder weapon from a case close to Athena in the early '90s resurfaces, flashbacks to 1989 show how Athena joined the LAPD and became the police officer she is today.

A skating mishap at an ice show; an accident involving a self-driving car; a fulfillment warehouse robot goes rogue; Eddie's after-hours fight club gets out of control; Hen struggles in her relationship with Karen.

The 118 responds to debris from a meteor shower crashing into an apartment building and a deadly fire caused by a hazardous waste truck crash; Hen struggles with guilt over her ambulance accident; Bobby introduces Eddie to an old friend.

A massive tsunami hits the Santa Monica Pier; Buck fears the worst when Christopher goes missing.

The team races to save workers in a high-rise during a fire drill, car accident victims, and siblings fighting over a family heirloom; Buck gives Bobby surprising news; Eddie helps Christopher deal with the trauma caused by the tsunami.

The 118 races to help protesters at a slaughterhouse and a wife who finds herself trapped in a "rage room" with her husband's mistress; Athena takes action after Michael, May and Harry experience a traumatic traffic stop.

Athena and the 118 respond to bizarre emergency calls on Halloween, including a flock of crows terrorizing a field trip, an office employee having a close encounter with an eight-limbed creature and a ghost-like girl wandering a neighborhood.

When a murder weapon from a case close to Athena in the early '90s resurfaces, flashbacks to 1989 show how Athena joined the LAPD and became the police officer she is today.

A skating mishap at an ice show; an accident involving a self-driving car; a fulfillment warehouse robot goes rogue; Eddie's after-hours fight club gets out of control; Hen struggles in her relationship with Karen.

The 118 responds to debris from a meteor shower crashing into an apartment building and a deadly fire caused by a hazardous waste truck crash; Hen struggles with guilt over her ambulance accident; Bobby introduces Eddie to an old friend.

A massive tsunami hits the Santa Monica Pier; Buck fears the worst when Christopher goes missing.

Living in her family home, a woman befriends her new neighbors, only to be plunged into a nightmare of threats, violence and betrayal; after her brother steps up to protect her, blood will be spilled and lives forever shattered.

Sophisticated crime fighters map the psychological and physical terrain of multiple murderers.

The team must set their personal beliefs aside when they go to rescue a cop being held hostage by an enraged family member.

Living in her family home, a woman befriends her new neighbors, only to be plunged into a nightmare of threats, violence and betrayal; after her brother steps up to protect her, blood will be spilled and lives forever shattered.

Sophisticated crime fighters map the psychological and physical terrain of multiple murderers.

The team must set their personal beliefs aside when they go to rescue a cop being held hostage by an enraged family member.

Living in her family home, a woman befriends her new neighbors, only to be plunged into a nightmare of threats, violence and betrayal; after her brother steps up to protect her, blood will be spilled and lives forever shattered.

The team must set their personal beliefs aside when they go to rescue a cop being held hostage by an enraged family member.

Sophisticated crime fighters map the psychological and physical terrain of multiple murderers.

Choi hires an old Navy colleague to join him in the ED; a final custody hearing threatens to separate Charles and his daughter; Maggie must make a choice that will change Auggie's life.

As Manning deals with her own trauma, she steps in to help a mother in need; Dean continues to stir the pot with more than one doctor; a patient comes to Med needing immediate treatment but doesn't want it from them.

Marcel deals with a patient who ends up having more in common with him than he thinks; Halstead and Choi clash over a pregnant patient with an irregular heartbeat.

Choi teams up with an unexpected person to treat a famous tennis player who is afraid his career might be over; Goodwin's new protocols cause a stir.

Archer and Choi respond to a scene that brings back some bad memories; when Carol's condition worsens, Manning is willing to do whatever it takes to get her mom feeling better.

An auto accident sends Goodwin into a spiral as she tries to help a young boy and his mother; Manning's secretive behavior begins to draw the attention of Marcel and Halstead.

Kate Johnson, a music education junior, at one of Oregon's prestigious colleges is murdered in her dorm room.

Creativity is put to the test when the designers must transform paper towels into high-fashion runway looks. The competition becomes personal when the designers must name who they believe is the weakest designer amongst them.

As Manning deals with her own trauma, she steps in to help a mother in need; Dean continues to stir the pot with more than one doctor; a patient comes to Med needing immediate treatment but doesn't want it from them.

Marcel deals with a patient who ends up having more in common with him than he thinks; Halstead and Choi clash over a pregnant patient with an irregular heartbeat.

Choi teams up with an unexpected person to treat a famous tennis player who is afraid his career might be over; Goodwin's new protocols cause a stir.

Archer and Choi respond to a scene that brings back some bad memories; when Carol's condition worsens, Manning is willing to do whatever it takes to get her mom feeling better.

An auto accident sends Goodwin into a spiral as she tries to help a young boy and his mother; Manning's secretive behavior begins to draw the attention of Marcel and Halstead.

Kate Johnson, a music education junior, at one of Oregon's prestigious colleges is murdered in her dorm room.

Creativity is put to the test when the designers must transform paper towels into high-fashion runway looks. The competition becomes personal when the designers must name who they believe is the weakest designer amongst them.

Two women have lived next door to each other since childhood; one of the women's ex-husband begins seeing the other, leading to a conflict; when property disputes are mixed in, the result is an act of violence that engulfs them all.

Criminals are betrayed by the clues their own bodies leave behind.

Sgt. Parker faces one of his toughest negotiations yet when the SRU tries to resolve a hostage situation at a bank, then finds that the suspect doesn't fit the original profile.

Two women have lived next door to each other since childhood; one of the women's ex-husband begins seeing the other, leading to a conflict; when property disputes are mixed in, the result is an act of violence that engulfs them all.

Criminals are betrayed by the clues their own bodies leave behind.

Sgt. Parker faces one of his toughest negotiations yet when the SRU tries to resolve a hostage situation at a bank, then finds that the suspect doesn't fit the original profile.

Two women have lived next door to each other since childhood; one of the women's ex-husband begins seeing the other, leading to a conflict; when property disputes are mixed in, the result is an act of violence that engulfs them all.

Sgt. Parker faces one of his toughest negotiations yet when the SRU tries to resolve a hostage situation at a bank, then finds that the suspect doesn't fit the original profile.

Criminals are betrayed by the clues their own bodies leave behind.

Nolan and Celina must stand guard at a hospital after a dangerous prisoner needs surgery; Aaron, Lopez and Harper look into a string of robberies; Tim and Lucy consider how their secret relationship will affect their work; Lopez gets unexpected news.

In the midst of a heatwave and a citywide blackout, Nolan and Aaron follow increasingly large leads after they discover criminals hiding at the station; Chen makes an alarming discovery after being called to a scene with a pungent smell.

Officer John Nolan and Bailey search for a mystery gunman after a shooting hits a little too close to home; Aaron struggles to live within his means; Wesley suspects that a judge is taking bribes.

With help from the FBI, Lopez puts everything on the line to help Elijah Stone take down a gang leader in exchange for her safety; Nolan and Bailey must deal with the secrets and shady dealings his late mother left behind.

The team must stop a militia from detonating a highly combustible truck in their possession; Nolan, Thorson, Juarez and Harper search for three men who may have been exposed to Ebola.

Now that Elijah and Abril have become allies, the team must rely on Monica, Elijah's lawyer, to uncover their plans; Officers Nolan and Juarez reopen her sister's case and discover a discrepancy that leads them on a new trail.

When Dim goes missing, Officer Chen and Sgt. Bradford, along with the CIA, set out to find him and enlist the help of Juicy.

Nolan and Celina must stand guard at a hospital after a dangerous prisoner needs surgery; Aaron, Lopez and Harper look into a string of robberies; Tim and Lucy consider how their secret relationship will affect their work; Lopez gets unexpected news.

In the midst of a heatwave and a citywide blackout, Nolan and Aaron follow increasingly large leads after they discover criminals hiding at the station; Chen makes an alarming discovery after being called to a scene with a pungent smell.

Officer John Nolan and Bailey search for a mystery gunman after a shooting hits a little too close to home; Aaron struggles to live within his means; Wesley suspects that a judge is taking bribes.

With help from the FBI, Lopez puts everything on the line to help Elijah Stone take down a gang leader in exchange for her safety; Nolan and Bailey must deal with the secrets and shady dealings his late mother left behind.

The team must stop a militia from detonating a highly combustible truck in their possession; Nolan, Thorson, Juarez and Harper search for three men who may have been exposed to Ebola.

Now that Elijah and Abril have become allies, the team must rely on Monica, Elijah's lawyer, to uncover their plans; Officers Nolan and Juarez reopen her sister's case and discover a discrepancy that leads them on a new trail.

When Dim goes missing, Officer Chen and Sgt. Bradford, along with the CIA, set out to find him and enlist the help of Juicy.

Nolan and Celina must stand guard at a hospital after a dangerous prisoner needs surgery; Aaron, Lopez and Harper look into a string of robberies; Tim and Lucy consider how their secret relationship will affect their work; Lopez gets unexpected news.

Using technology to solve crime.

Murder weapons often hold several critical forensic clues about the crime.

Fire, water, earth - killers call on all the elements in their attempt to cover up their crimes.

Voight pulls Darius in after Crawford asks intelligence to investigate a dangerous drug, but there is little trust in the relationship; when a plan to nail a dealer goes awry, the team must make a tough decision about Darius.

After injuring herself while pursuing a suspect, Burgess receives a shocking diagnosis; a homicide case turns into a missing persons case, with a sinister twist; Voight has to decide between justice and the letter of the law.

Halstead's secret ongoing relationship with a woman connected to another case puts him in jeopardy.

As it awaits news of Halstead's fate, the team turns its attention to an illegal arms dealer; Atwater discovers his brother is in Chicago and could be tied to the case; Voight must deal with Halstead's shooter; Burgess makes her decision.

Ruzek and Burgess' secret begins to have severe implications for their police work; a series of deadly acts of vandalism causes tensions to run high in the insular neighborhood of Canaryville; Atwater tries to reach out to his brother.

Voight makes a deal with Darius Walker to help bring down a rogue group of dirty cops dealing drugs that were supposed to be destroyed; Upton clashes with Voight and enacts her own form of justice.

After receiving a distressing 911 call, Burgess enlists the team's help to track down a girl caught up in a sex-trafficking ring.

Voight pulls Darius in after Crawford asks intelligence to investigate a dangerous drug, but there is little trust in the relationship; when a plan to nail a dealer goes awry, the team must make a tough decision about Darius.

After injuring herself while pursuing a suspect, Burgess receives a shocking diagnosis; a homicide case turns into a missing persons case, with a sinister twist; Voight has to decide between justice and the letter of the law.

Halstead's secret ongoing relationship with a woman connected to another case puts him in jeopardy.

As it awaits news of Halstead's fate, the team turns its attention to an illegal arms dealer; Atwater discovers his brother is in Chicago and could be tied to the case; Voight must deal with Halstead's shooter; Burgess makes her decision.

Ruzek and Burgess' secret begins to have severe implications for their police work; a series of deadly acts of vandalism causes tensions to run high in the insular neighborhood of Canaryville; Atwater tries to reach out to his brother.

Voight makes a deal with Darius Walker to help bring down a rogue group of dirty cops dealing drugs that were supposed to be destroyed; Upton clashes with Voight and enacts her own form of justice.

After receiving a distressing 911 call, Burgess enlists the team's help to track down a girl caught up in a sex-trafficking ring.

Voight pulls Darius in after Crawford asks intelligence to investigate a dangerous drug, but there is little trust in the relationship; when a plan to nail a dealer goes awry, the team must make a tough decision about Darius.

After injuring herself while pursuing a suspect, Burgess receives a shocking diagnosis; a homicide case turns into a missing persons case, with a sinister twist; Voight has to decide between justice and the letter of the law.

Halstead's secret ongoing relationship with a woman connected to another case puts him in jeopardy.

As it awaits news of Halstead's fate, the team turns its attention to an illegal arms dealer; Atwater discovers his brother is in Chicago and could be tied to the case; Voight must deal with Halstead's shooter; Burgess makes her decision.

Ruzek and Burgess' secret begins to have severe implications for their police work; a series of deadly acts of vandalism causes tensions to run high in the insular neighborhood of Canaryville; Atwater tries to reach out to his brother.

Voight makes a deal with Darius Walker to help bring down a rogue group of dirty cops dealing drugs that were supposed to be destroyed; Upton clashes with Voight and enacts her own form of justice.

After receiving a distressing 911 call, Burgess enlists the team's help to track down a girl caught up in a sex-trafficking ring.

In fall 1991, Toronto was paralyzed by the story of a missing six-year-old girl found raped and murdered in the boiler room of her apartment building; with four suspects, CSIs turned to the brand-new science of DNA to catch the killer.

In 1988, motorists discover human body parts dumped along the highway.

In 1990, Gainesville, Fla., becomes the site of a number of coed murders.

Severide and Casey try to find the best fit for Kidd; Ritter, Gallo and Violet help plan an event for Mouch.

The firehouse reacts to some exciting news; a mysterious stranger arrives, and a shocking call takes Severide's breath away.

Firehouse 51 deals with the aftermath of the capsized boat rescue; Gallo, Ritter and Violet discuss plans for a side gig.

A video of Casey from the roof rescue goes viral; Mouch sets up a Little Free Library at Firehouse 51; Herrmann breaks protocol.

Griffin learns the truth about his father's death and reveals why he really came to visit Casey; Gallo, Ritter and Violet take steps to expand their microbrewery business.

Kidd spreads her wings as a lieutenant; Chief Hawkins rides with Ambulance 61 to learn more about Brett; Casey takes a trip out of town; a Ritter date night turns into an emergency situation.

Casey makes a life-altering decision; Gallo, Ritter and Violet agree to an interview and photo shoot; Brett and Mouch launch the paramedicine program; Cruz comes closer to fatherhood.

Severide and Casey try to find the best fit for Kidd; Ritter, Gallo and Violet help plan an event for Mouch.

The firehouse reacts to some exciting news; a mysterious stranger arrives, and a shocking call takes Severide's breath away.