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Trailer
Cast
- Patrick Wymark as Inspector Holloway
- Margaret Johnston as Mrs. Von Sturm
- John Standing as Mark Von Sturm
- Alexander Knox as Frank Saville
- Judy Huxtable as Louise Saville
- Don Borisenko as Donald Loftis
- Thorley Walters as Martin Roth
- Robert Crewdson as Victor Ledoux
- Colin Gordon as Dr. Glyn
- Tim Barrett as Morgan
- Frank Forsyth as Tucker
- Olive Gregg as Mary
- Harold Lang as Briggs
- John Harvey as Reinhardt Klermer
Crew
- Freddie Francis · Director
- Robert Bloch · Writer
- Max Rosenberg · Producer
- Milton Subotsky · Producer
- Elisabeth Lutyens · Composer
- John Wilcox · Cinematographer
- Oswald Hafenrichter · Editor