The fourth season returns as Will struggle with his mental health and anger management following the return of serial killer James Ulster, who breaks out of prison to haunt him, throwing Will into a mental tailspin and forcing him to confront his past, including his mother's death. As he tries to build a relationship with his birth father Caleb, he undergoes therapy with Dr. Roach to handle his rage. Angie navigates a new relationship with Seth, while Faith investigates cases that challenge her, including a hostage situation and human trafficking.