Mannion searches for a vigilante who is killing convicted child molesters; Ella learns that one of her neighbors is a former sex offender.

Mannion vows to better protect cab drivers after a cabbie fatally shoots a passenger he thought was trying to rob him. Also, a new U.S. Attorney stirs up controversy, and McGregor gets jealous when Nancy receives flowers from an unknown person.

Detective Travis Haywood is shot while performing an undercover operation by an off-duty cop. Mannion has to handle the manipulative press that keeps referring to the incident as the third time a black cop has been shot by a white cop. Detective Heywood dies and the issue of prejudice gets stronger as the black cops demand the shooter to be severely punished.