
Caught in a loveless marriage, Dr. John Winnington (Ronald Howard) can't stop himself from falling for his wife's (Mary Laura Wood) younger sister, Christine (Olga Edwardes). But when he suddenly becomes the prime suspect in his wife's tragic murder, John relies on his friend Eric (John Bentley) to clear his name. This classic murder mystery encourages viewers to evaluate all of the clues and guess the killer's identity.
Cast

Ronald Howard
Dr.John Winnington

Olga Edwardes
Christine Shaw

John Bentley
Eric Blair

Mary Laura Wood
Sophie Winnington

Patrick Barr
Vincent Humphries

Sheila Burrell
Annette

Russell Napier
Inspector Markham
Mary Jones
Mrs. Humphries
Alan Robinson
Solicitor

Ian Fleming
Coroner

Tom Gill
Travel Agent Clerk
Tucker McGuire
American Woman
Richard Shaw
Lorry Driver
Daniel Wherry
Padre
Bruce Beeby
Sgt. Hawkins (uncredited)
Victor Harrington
Cocktail Party Guest (uncredited)
Robin Dowell
Boy Patient (uncredited)
Crew
Charles Saunders
Director
Francis Edge
Screenplay
John Temple-Smith
Screenplay
Jack Slade
Editor
Eric Cross
Cinematography
George Fowler
Assistant Director

Robert S. Baker
Producer

Monty Berman
Producer
Joan Carpenter
Hairstylist
Jill Carpenter
Makeup Artist
George Burgess
Sound Supervisor
Harry Benson
Sound Recordist
John Lanchbery
Music Director, Music
Maurice Temple-Smith
Additional Dialogue
Freddie Cooper
Clapper Loader
Joanna Busby
Continuity
Jack Hanbury
Production Manager

Desmond Davis
Focus Puller
Johnny Goodman
Assistant Production Manager
Ray Simm
Art Direction
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