The Deception team gets an unexpected partner, while Gunter makes a discovery that will change the team’s lives forever.

When Erin tries to take down a gang leader using his law-abiding brother as bait, the family debates her methods.

After Cottonmouth and Scarfe’s bloody clash, Luke realizes that saving the community may turn former allies into enemies, and enemies into allies.

Awaiting his formal arraignment at Rikers Island, Naz realizes that his survival, or perhaps his demise, rests with a particular inmate, Freddy.

Casey discovers a new crack house on the block that is harboring a female junkie. Dawson and Brett get assigned a new trainee for the shift. Meanwhile, Severide gets an…

Reese and Finch’s game of cat and mouse with Detective Carter becomes infinitely more complicated when The Machine declares that she is their newest POI.