Melanie Vargas is a hardworking, hotshot Latina federal prosecutor. Her home life is a bit chaotic, since she just caught her husband in an affair, although she's still trying to work things out, if only for her baby daughter. One evening she takes the child out on an innocent stroll and walks right into a crime scene: a wealthy former fellow prosecutor has been murdered. Melanie knows that with her personal problems she should stay away from what promises to be a demanding, high-profile case. Yet it's a career-making case and she aggressively signs on, only to be led into a race for her life against a dark, sadistic killer who seems to always be one step ahead of her.