© 2026 The Couch Critic
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"What made this the most diabolical murder weapon ever used?"
Loner Mark Lewis works at a film studio during the day and, at night, takes racy photographs of women. Also he's making a documentary on fear, which involves recording the reactions of victims as he murders them. He befriends Helen, the daughter of the family living in the apartment below his, and he tells her vaguely about the movie he is making.
41 Cast Members
Karlheinz Böhm
Mark Lewis
Moira Shearer
Vivian
Anna Massey
Helen Stephens
Maxine Audley
Mrs. Stephens
Brenda Bruce
Dora
Miles Malleson
Elderly Gentleman Customer
Esmond Knight
Arthur Baden
Martin Miller
Dr. Rosen
Michael Goodliffe
Don Jarvis
Jack Watson
Chief Insp. Gregg
Shirley Anne Field
Pauline Shields
Pamela Green
Milly
John Barrard
Small Man (uncredited)
Robert Crewdson
Shop Assistant on Film Set (uncredited)
Nigel Davenport
Det. Sgt. Miller (uncredited)
Michael Powell
Mark's Father - A.N. Lewis (uncredited)
Susan Travers
Lorraine the Model (uncredited)
Keith Baxter
Det. Baxter (uncredited)
John Chappell
Clapper Boy (uncredited)
Roland Curram
Young Man in Sports Car (uncredited)
