As 15 Division recovers from the shooting of Det. Luke Callaghan, a series of arsons culminates in the torching of a laundromat - and the rookies are forced to confront their own burning issues. Chris and Gail take to the streets and encounter a man from Chris’s past, while Traci interrogates a young firebug found at the arson scene. Meanwhile, when Andy tries to stop the grieving widow from entering the burnt-out laundromat, the two women are trapped in an unstable building with a burnt corpse and must rely on the Fire Department to cut them free from the debris.