Detective Rollins comes home to find her sister Kim in her apartment, beaten up by her abusive boyfriend, and this time, pregnant. The SVU squad does all they can to keep her safe, but an unexpected visitor forces Rollins to take drastic action. Once again Internal Affairs must open an investigation into the SVU's unconventional methods, and the squad is in jeopardy of losing one of their own.

As he prepares to testify against pimp Bart Ganzel, a woman comes forward claiming that Brian Cassidy raped her while he was an undercover detective. ADA Barba, Detective Benson and the SVU squad nervously await the outcome of the trial, concerned for Cassidy as well as the ongoing prosecution of Ganzel. When prosecutor Derek Strauss pushes hard for a win, Cassidy and his lawyer use some surprising methods of defense, with shocking consequences for Detective Amaro.