"Sebastian is an undisciplined mathematics genius who works in the "cipher bureau" of the British Intelligence. While cracking enemy codes, Sebastian finds time to romance co-worker Rebecca Howard."
Dirk Bogarde
as Sebastian
Susannah York
as Rebecca Howard
Lilli Palmer
as Elsa Shahn
John Gielgud
as Head of Intelligence
Janet Munro
as Carol Fancy
Ronald Fraser
as Toby
Margaret Johnston
as Miss Elliott
Nigel Davenport
as Gen. Phillips
John Ronane
as Jameson
Hayward Morse
as Gavin
Donald Sutherland
as Ackerman
Ann Beach
as Pamela
Susan Whitman
as Tilly
Ann Sidney
as Naomi
Veronica Clifford
as Ginny
Louise Purnell
as Thelma
Portland Mason
as 'UG' Girl
James Belchamber
as Man with Dog
Charles Farrell
as Taxi Driver
Charles Lloyd Pack
as Chess Player
Alan Freeman
as TV Disc Jockey
Jeanne Roland
as Randy
Lynn Pinkney
as Joan
Sally Douglas
as Uncredited
Stuart Hoyle
David Greene
Director
Gerald Vaughan-Hughes
Screenplay
Brian Smedley-Aston
Editor
Gerry Fisher
Producer
Michael Powell
Herbert Brodkin
Richard Williams
Opening Title Sequence
Leo Marks
Story
John Pellatt
Associate Producer
Edith Hamlin
Casting
Wilfred Shingleton
Production Design
Fred Carter
Art Direction
Terence Morgan
Set Decoration
Bob Lawrance
Makeup Artist
Gladys Leakey
Hairdresser
Clifton Brandon
Production Manager
Gordon Gilbert
Assistant Director
Terence Morgan II
Set Dresser
Alf Pegley
Property Master
H.L. Bird
Sound
Tristram Cary
Sound Effects
Don Challis
Sound Editor
Gerry Humphreys
Jimmy Turrell
Camera Operator
Wally Byatt
Focus Puller
Bridget Sellers
Wardrobe Master
Sue Yelland
Costume Consultant
Keith Palmer
Assistant Editor
Ann Skinner
Continuity
Zelda Barron
Director of Photography
Jerry Goldsmith
Original Music Composer