When a death threat aimed at a local priest leads Andy and Nick to a neighborhood drug lord, the officers realize that they're navigating a delicate war zone and that the priest may be hiding some surprising secrets of his own. Meanwhile, Gail and Traci pick up one of the drug runners - a young girl whose refusal to be an informant compels Traci to make a major decision about her career. Chris and Swarek clash over what it takes to make a good cop, and Dov's new relationship takes a dramatic and dangerous turn.