Retired homicide detective Ray Archer (winner of the Oscar Al Pacino) along with criminal profiler Willem Ruineym (Karl Urban) and investigative journalist Christi Davies (Brittany Snow) are trying to capture a serial killer. The case becomes one of the toughest policemen in the career of the police, drawing the three of them into a hangman game.

Like "Seven", "M Like a Killer" takes viewers on a terrifying and macabre journey, introducing them to the dark world of a serial killer.