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Severide's old friend arrives, hoping for a second chance with the Chicago Fire Department. Meanwhile, Mills tries to regain his active squad status, Mouch confronts his fear about meeting his child, and Brett and Dawson set out to have a big night out.
Herrmann saves an infant in a structural fire, then goes on a quest to solve dubious circumstances about the event. Meanwhile, Severide retraces important friendships from his youth, and Cruz and Brett's relationship reaches a critical juncture.