"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."
Vincent Ball
as Bill Vernon
Betty McDowall
as Joan Scott
Geoffrey Toone
as Colonel Justin
Clare Owen
as Pam Jennings
Marianne Stone
as Miss Green
Raymond Adamson
as George
Peter Illing
as Kovali
Richard Caldicot
as Fisher
Basil Beale
as Harris
Dermot Walsh
as Phil Scott
Michael Balfour
as Newsagent
Tom Gill
as Photographer
Leon Cortez
as Caretaker
Colin Rix
as Police Sergeant
Anthony Baird
as Barman
Patsi Karr
as Kovali's Secretary
Denis Holmes
as Security Officer
Arthur English
as Punter in Betting Shop
Ernest Morris
Director
Reg Bream
Draughtsman
Elliot Scott
Art Direction
Reginald Hearne
Writer
Ronald Liles
Associate Producer
John I. Phillips
Producer
Martin Slavin
Original Music Composer
Walter J. Harvey
Director of Photography
David Hawkins
Editor
Ivy Emmerton
Hairstylist
Alice Holmes
Bunty Phillips
Makeup Artist
Stuart Freeman
Assistant Director
Fred Turtle
Sound Recordist
Gus Drisse
Camera Operator
Marjorie Lavelly
Continuity