On Halloween, two men both die at the same time: George Miller commits suicide by jumping from a hotel roof, and Vito Minelli angers the mob when he can't pay off his gambling debts. When George is revived and nursed back to health, he begins to have nightmares about Vito's life. His psychiatrist, Dr. Curtis, thinks that he's mentally ill, but Lt. Ashley believes that he's responsible for a series of brutal murders. George eventually discovers that he's been possessed by Vito, who has been killing the gangsters responsible for his own death.