After seven young women in a six month time span are raped by a flash and dash assailant on the city subways, the brass calls in a psychiatrist to help the team get into the head of the perp. When he is caught, he possesses the driver's license of a new victim who could put him away.

A Romanian immigrant is being held as a psychological prisoner by her abusive employer and his wife, who is also traumatized by years of abuse and is willing to commit murder to protect her husband. A forensic psychologist analyzes the team, and presents disturbing findings to Cragen, suggesting that one of the detectives be removed from the team.