The house used by Ralph Bates & Judy Geeson previously appeared as: 1. the house where most of the film is set The Traitor [1957]; 2. the hotel used by the lovers in The Rough & The Smooth [1959]; 3. the tennis club in School For Scoundrels [24/3/60]; 4. Jane's house in "The Nudist Story" [5/60]; 5. Rod Taylor's training ground in The Liquidator [1965]; 6. the Eatons' house in The Devil Rides Out [1968]; 7. "The Elizabethan Hotel" in The Avengers S7 Episode 20 "Wish You Were Here" [12/2/69]; 8. Paul Kirstner's house in Randall & Hopkirk (Deceased) Episode 7 "Murder Ain't What It Used To Be" [2/11/69]; 9. "Merstham Manor" in Randall & Hopkirk (Deceased) Episode 9 "The House on Haunted Hill" [16/11/69]; 10. garden for croquet in Department S 2/8 The Perfect Operation [26/11/69] and 11. Mrs Howe's house in Randall & Hopkirk (Deceased) Episode 14 "Who Killed Cock Robin?" [21/12/69] 12. the house named "Marling Dale" Byrom Blain is chauffeured to at the start of the episode in Department S 2/14 "The Bones of Byrom Blain" [28/1/70]; 13. the house used as base by Carter and Drieker in Department S 2/19 "A Ticket to Nowhere" [11/3/70]; and would appear again as: 14. the restaurant visited by Strand in Special Branch S4 Episode 12 "Diversion" [2/5/74]; 15. Green's house in The Professionals 2/5 In The Public Interest [4/11/78] and 16. the honeymoon hotel in Hammer House of Mystery & Suspense episode 1 Mark of The Devil [5/9/84].
Director Jimmy Sangster said Joan Collins was a little difficult to work with. She had been a star but her career was in a severe dip when she did this movie and she wasn't happy about it. It didn't rise again until she did the US TV show Dynasty (1981).
This was the last of three films directed by Jimmy Sangster. The others were Les horreurs de Frankenstein (1970) and La soif du vampire (1971). Ralph Bates appeared in all three films.
Co-stars Joan Collins and Peter Cushing had been castmates also in Histoires d'outre-tombe (1972) released a few months earlier, but since they were in different stories in that film, they did not appear together on screen.
After Une messe pour Dracula (1970), Les horreurs de Frankenstein (1970), La soif du vampire (1971) and Dr. Jekyll et Sister Hyde (1971), this was Ralph Bates' fifth and final Hammer film.