Following Dov's discovery of Chris's cocaine problem, Chris seems to have gotten back on the right track. But while working a residential home invasion case, Dov realizes that Chris might not be ready to change after all. Meanwhile, back at the station, Steve informs Traci that he's about to raid an illegal gambling den where her ex-husband is a regular. Both Traci and Dov must make decisions that will greatly affect the people closest to them.

With a car-bomber still on the loose, the officers of 15 Division work frantically to track down the suspect while trying to figure out if more bombs have been planted around the city. Just when it feels like the worst is over, a bomb goes off in the evidence room of the station - with Andy McNally inside. But the violence - and the surprises - aren't over, leaving Sam Swarek dumbfounded.