Simon Cross is a type-A personality advertising executive, who has a penchant for sleeping with married women. When one lover's husband learns of the affairs, Simon finds himself at the mercy of a madman. The advertising executive develops a very different view of life and the people around him, but not before things are radically changed in ways he never dreamed possible. As Simon's world is turned upside-down, police are hunting for a murderer. Soon afterward, Simon is paid an unwelcome visit by the killer. The maniac demands Simon do the one thing he can't do...or die.