
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.

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