Andy and Gail go undercover as cocktail waitresses to clean up a drug-infested club, but get more than they bargained for when their fellow waitress turns out to be involved with a vicious criminal. Meanwhile, Traci wrestles with feelings for her old flame, Detective Barber, Dov tries to weather the storm when a young woman files a complaint against him, and Andy unwittingly opens up to Sam about her commitment to Luke.

As the 15th Division attempts to recover from an explosive event involving one of their own, a series of arsons culminates in the torching of a laundromat. The list of suspects grows, as 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, Andy's effort to stop the grieving widow from entering the burnt-out laundromat resultS in the two women being trapped in the unstable building, and what seems like a straightforward case of arson ends up being something much bigger.