Another unidentified body was found. The local police invited special agent Elena Scott (Angelina Jolie) to assist in the investigation when there was no progress in the investigation of the case. Scott's unconventional way of handling the case caused dissatisfaction with his colleague Picard, but with his keen intuition and extraordinary insight, Scott quickly figured out the clues: the criminal suspect Martin Ashe has been playing the role of others for 20 years. After each murder, he will play the role of the dead and start a new life. Constar (Ethan Hawke) is a witness to the last murder. When working with Scott, the two have a good impression of each other, but between the police identity, Scott always keeps a distance from him. On the day when this serial murder case ended, the deep feelings of the two finally burst out. On the second day after the two had a relationship, Scott witnessed James killing the suspect's mother in the elevator. At this time, she realized that she was falling into a trap... This film is adapted from the novel of the same name by British novelist Michael Pye.