When a woman begins to investigate her husband's mysterious death in a plane accident she discovers the involvement of a woman known simply as Diana.
Cast

Vincent Ball
Bill Vernon

Betty McDowall
Joan Scott

Geoffrey Toone
Colonel Justin
Clare Owen
Pam Jennings

Marianne Stone
Miss Green

Raymond Adamson
George

Peter Illing
Kovali

Richard Caldicot
Fisher
Basil Beale
Harris

Dermot Walsh
Phil Scott

Michael Balfour
Newsagent

Tom Gill
Photographer
Leon Cortez
Caretaker
Colin Rix
Police Sergeant

Anthony Baird
Barman
Patsi Karr
Kovali's Secretary
Denis Holmes
Security Officer

Arthur English
Punter in Betting Shop
Crew
Ernest Morris
Director
Reginald Hearne
Writer
David Hawkins
Editor
Walter J. Harvey
Director of Photography
Stuart Freeman
Assistant Director
John I. Phillips
Producer
Ronald Liles
Associate Producer
Gus Drisse
Camera Operator
Ivy Emmerton
Hairstylist
Alice Holmes
Hairstylist
Bunty Phillips
Makeup Artist
Fred Turtle
Sound Recordist
Martin Slavin
Original Music Composer
Marjorie Lavelly
Continuity
Reg Bream
Draughtsman
Elliot Scott
Art Direction
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