A man descends into paranoia after trapping what he believes to be the devil in his basement, but things take a dark turn when his family unexpectedly arrive for Christmas.

Someone does a nasty hatchet job on a San Francisco big shot and the Assistant D.A. takes charge of the investigation. Through a web of blackmail and prostitution involving the Governor, an old lover of the lawman emerges as a prime suspect and he has to deal with his personal feelings as well as the case.