As Laura and the team investigate who exposed an undercover cop and caused his murder, an unseen attacker breaches their systems and targets them, forcing the 2nd Precinct to switch tactics in order to find him before he gets another officer killed.

The violent death of a perfume magnate leaves the detectives wondering who they can trust. As secrets are revealed, Laura and Jake find agreeing on a primary suspect as difficult as agreeing on the state of their relationship.