- Released on November 11, 1976 (UK)
- Running time: 1 hr 49 min (109 min) (USA) | 1 hr 38 min (98 min) (USA) | 1 hr 40 min (100 min) (Argentina)
- Production Co.: Peter Walker (Heritage) Ltd.
- Distribution Co.: Columbia-Warner Distributors (1976) (UK) (theatrical) | Niles International (1977) (USA) (theatrical) | Astral Films (1977) (Canada) (theatrical) | Columbia-Warner Filmes de Portugal (1978) (Portugal) (theatrical)
- Directed by Pete Walker
- Written by David McGillivray (screenplay), Murray Smith (adaptation) (uncredited)
- Starring: Lynne Frederick, John Leyton, Stephanie Beacham
- A newly-married woman becomes convinced someone from her past is stalking her, but nobody believes her until the bodies start to pile up.
- Schizophrenia... When the left hand doesn't know who the right hand is killing!!