After saving her three-year-old daughter from a car-jacking, off-duty police detective Jocelyn Rush ends up in the ER. The last person she expects to run into is Anita Grant, former prostitute and an old acquaintance from Jocelyn's days on patrol. In spite of her obvious injuries - mutilated hands and feet - Anita refuses to talk about what happened. Reluctantly, Jocelyn backs off, and Anita's case goes to Philadelphia's Special Victims Unit.
Before long, Jocelyn is pulled into the SVU's investigation. Anita is finally ready to talk, but only to Jocelyn. Her story is harrowing, even to a seasoned veteran like Jocelyn. Working with SVU, Jocelyn's investigation unearths a series of similar crimes going back four years. Three men are preying on local prostitutes, viciously assaulting and mutilating them.
The police apprehend two of the suspects, but the third eludes capture. As the hunt for the most sadistic of the three intensifies, and his crimes escalate, Jocelyn and her colleagues have precious few leads. Then a monster from Jocelyn's past resurfaces. She doesn't want to be reminded of the terrible secret that destroyed her family nearly 20 years earlier, but the man offers her a lead that could crack Anita's case.
To solve it, Jocelyn must connect her past with her present-before a sadistic attacker sets his sights on her.