Cunning and evil, poisoned by a lifetime of love withheld, Eileen Cartwright has an unrivaled passion for revenge. When the rich, middle-aged widow falls in love with her lawyer, she goes to fatal lengths to make him hers. Prosecutor Helen West is assigned to the case, but when Eileen's extraordinary evil reaches out even from behind prison bars, the investigation reaches a climax of frightening and frenzied violence.