CENTER MASS – A homeless man’s murder leads Intelligence to a criminal who has evaded capture for years. Rojas has a troubling experience with a young mentally ill man.
I WAS HERE – Burgess enlists the team’s help to track down a girl caught up in a sex-trafficking ring.
The Devil You Know – 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.
43rd and Normal – Ruzek and Burgess’s 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, but only pushes him further away.
Mercy – As they await news of Halstead’s fate, the team tries to focus on work, turning their attention to an illegal arms dealer. Atwater discovers his brother, Jordan, is back in Chicago and could be tied to the case. Voight faces the tricky task of how to deal with Halstead’s shooter. Burgess finally makes her decision.
Absolution – Halstead’s secret ongoing relationship with a woman connected to another case puts him in jeopardy.
No Regrets – 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.
Informant – Voight pulls Darius in after Crawford asks Intelligence to investigate a dangerous drug, but there is little trust in the relationship.
False Positive – The shocking murders of young boys affects Halstead. Crawford encourages Intelligence to use a new facial-recognition software to help identify a suspect, but the plan backfires.
Brother’s Keeper – 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.