Heather Gunn

An arsonist targets Lt. Severide. Meanwhile, Station 51 is under scrutiny by Gail McLeod, a financial consultant for the city who is deciding if any firehouses should be closed. Mouch receives a visit from his Japanese girlfriend, Lt. Casey "celebrates the one-year anniversary of Andy's death, and Shay suspects Severide's paternity.

Brandon and Kelly continue to hide their relationship from Dylan, but the truth is always bound to come out somehow. Meanwhile, Donna plans to take the semester off to participate in a debutante ball.