Voight teams up with an unlikely ally to take a killer off the streets while fighting to bring his Intelligence unit back together.
The Intelligence Unit races against time when a man from Torres' own neighborhood is violently abducted.
A homicide in the neighborhood where Burgess and Ruzek reside forces the team to investigate complicated relationships within the tight-knit community they call home.
A string of violent robberies across the city digs up one family's secrets; a surprising detail of Voight's past resurfaces.
Atwater reunites with an old friend from his academy days after a bombing rocks downtown Chicago.
Torres is dragged into a deadly conspiracy when a routine errand takes a violent turn.
Voight's suspicions ring true when a violent break-in steers the Intelligence Unit back to a chilling figure from a previous case.
Voight and the team work together to uncover the truth of the Bell case before more lives are lost.
Platt finds herself challenged when a simple favor for a former recruit spirals into something far more devastating.
Torres investigates the conspiracy surrounding the Morgan case, leading Intelligence into a tangled web of secrets.
Details about Imani's past emerge as the Intelligence Unit seeks the truth behind the sudden resurfacing of a decades-old missing child case.
Burgess fights for her life as the team scrambles to find her kidnapper; Dep. Supt. Sam Miller is desperate to find her son's killer; Voight and Upton deal with the aftermath of their decision; Ruzek struggles with the pressure of the situation.
When a P.D. informant is murdered, the team digs in to track down the perpetrator only to learn a shocking truth; Voight and Ruzek strategize to help Burgess.
Halstead's past resurfaces when a former Army colleague is implicated in a deadly blast; as the FBI launches an investigation into Roy's disappearance, Upton feels the pressure of the secret she and Voight are sharing.
When Upton and Ruzek answer an emergency call to an abandoned house, their investigation leads them down a dark path.
As the team works to solve a deadly shooting in Burnside, Atwater realizes he has a very personal connection to the case.
Ruzek reunites with an old colleague to take down a crime ring, but when things don't add up, Voight and Burgess do some investigating of their own.
As the team investigates the stabbing of a father with two young daughters, they begin to suspect there is more to the story than meets the eye; the FBI investigation into Roy Walton's death intensifies while Voight, Upton and Halstead feel the heat.
With the FBI closing in on the Roy Walton investigation, Voight and Halstead strategize a way out; after a city bus driver is shot by a passenger, the team investigates a possible abduction.
Ruzek and Atwater are tasked with making an arrest after a high-profile shooting; the situation becomes complicated when it's clear someone doesn't want them to make it back to the station.
Ruzek's father, Bob, goes missing, and the team races to find him before it's too late.
A wellness check on a family reveals signs of foul play, and Detective Upton is determined to find the parents and young daughter; as she delves further into the troubled family dynamics, she reflects on her own childhood trauma.
The team pursues a crafty serial rapist; Sgt. Voight finds himself resisting some old, familiar tendencies in his quest for justice.
The shocking murder of a young pregnant woman leads the team on a desperate hunt for the killer, revealing something even darker than expected; Burgess has to make a tough decision about Makayla.
After a series of brutal home-invasion robberies, Upton immerses herself in the case and finds herself caught between Voight and Halstead.
Voight and the team pursue a ruthless crime ring whose business has hit close to home; as they dig deeper, the extent of the danger becomes more apparent; Deputy Superintendent Samantha Miller second-guesses her decisions.
Voight and the team muster all their expertise to bring down a deadly crime ring; Burgess finds herself in a dangerous situation.