When a young man is found dead of an apparent overdose, Dixon fiercely pursues a homicide investigation as an old unsolved case comes back to haunt her. Price and Maroun risk putting a witness in harm's way to expose their suspect.

The murder of an off-duty NYPD detective threatens to tear the city apart; Cosgrove mourns the loss of a friend and asks Capt. Benson for help solving the case; McCoy and Price disagree on how to prosecute the culprit.

When a music mogul is found dead, Shaw and Riley clash with an undercover officer unwilling to cooperate. Price and Baxter disagree on whether the victim's reputation could help or hinder the jury's decision in the case.