A grad student's disappearance leads Andy and Nick to discover the woman's double life as a high-end escort. When a pattern of missing women emerges, Gail, who is physically similar to the victims, is sent in on an undercover sting operation. Meanwhile, Dov and Chris are following a different lead, and when they uncover the body of a missing woman, the case takes an even more dangerous turn. A twisted killer is still at large, but, now, does he have his sights set on Gail?