After a devastating fire erupts at a surgery center, Kidd works to hunt down the true cause. Violet, Novak and Vasquez grapple with shifting relationships. Molly's hosts its first trivia night.

Severide is forced to overcome obstacles at the firehouse. Cruz finds himself at a loss amid the new changes in his family.

Severide investigates a fire at an abandoned store inhabited by squatters. Mouch pens a memoir about his life.

Kevin arrives at the ville where his father served; Kate pursues a new opportunity; Randall debates Councilman Solomon Brown; in the past, Jack struggles to get through to his brother.

The Pearsons gather to support Kevin at his movie premiere. The teenage Big Three make college decisions.

The Pearsons rally around Kate as she undergoes a medical procedure.

Kate struggles with Toby's depression. Randall makes time for Kevin, who obsesses about Jack's past.

New York, NY, 1963. Two young women are brutally murdered in their Upper East Side apartment. If these girls aren't safe, who is? The NYPD is under pressure to solve the high-profile case but make a tragic misstep while investigating.