Rae Gray

When a call comes in about a woman stabbing a man then fleeing the scene, Burgess (Marina Squerciati) and Lindsay (Sophia Bush) go investigate and find a young woman with the weapon in her hand. The suspect turns out to be a victim and she tells Olinsky (Elias Koteas) that she was held hostage for months and her kidnapper attempted to psychologically manipulate her into forgetting her identity while he physically abused her. The team sets out to find the woman's abductor before he can harm anyone else. Meanwhile, tensions are high at the station when Ruzek (Patrick John Flueger) accuses Roman (Brian Geraghty) of having feelings for Burgess.

Severide finds that he shares a familiar past with Eric Whaley, the Lieutenant who was brought into the firehouse to help out. Dawson lets Shay in on her secret, while Casey deals with family issues. Meanwhile, a bad batch of heroin on the streets has Boden and the team scrambling, while Clarice and Shay find they have a new problem to overcome.

Still finding their place, Alicia and Nick fall in with new crowds while Madison discovers Otto's past mimics that of her own.

A new threat reveals itself to Madison and Troy as they search for answers. Alicia must reconcile with her past decisions.

News of incoming danger spreads throughout the community as Madison struggles to keep everyone together. Nick grapples with a hard truth.