Harlee and Wozniak investigate Caroline's murder, putting Harlee and Nava's relationship in an awkward place because she can't reveal her connection to the crime or the methods she will use to solve it. Wozniak focuses on determining which member of his crew is informing to Verco as Loman uncovers a much deeper secret.

Wozniak goes after Bianchi for breaking their agreement. Harlee seizes the opportunity to unite the team around an illegal mission to repay Tufo's brother's debt to a local drug dealer. Stahl heightens the stakes making good on his threat to go after the crew. Wozniak faces the impossible decision to pick between his team and Ayres just as his son, Nate, makes an effort to reunite. Also starring Drea de Matteo, Dayo Okeniyi, Vincent Laresca, Hampton Fluker, Sarah Jeffery and Gino Anthony Pesi. Guest starring Michael Laurence, Leslie Silva and Cameron Scoggins.