"A British agent's son is kidnapped and held for a ransom of diamonds. The agent finds out that he can't even count on the people he thought were on his side to help him, so he decides to track down the kidnappers himself."
Michael Caine
as Maj. John Tarrant
Donald Pleasence
as Cedric Harper
Delphine Seyrig
as Ceil Burrows
Clive Revill
as Alf Chestermann
John Vernon
as McKee
Joss Ackland
as Chief Supt. Wray
Janet Suzman
as Alex Tarrant
Catherine Schell
as Lady Melissa Julyan
Joseph O'Conor
as Sir Edward Julyan
Denis Quilley
as Bateson
Derek Newark
as Monitoring Policeman
Edward Hardwicke
as Mike McCarthy
Maureen Pryor
as Jane Harper
Joyce Carey
as Miss Monley
Preston Lockwood
as Ilkeston
Molly Urquhart
as Margaret
David Daker
as MI5 Man
Hermione Baddeley
as Hetty
Patrick Barr
as Gen. St. John
Yves Afonso
as Jacques (uncredited)
Del Baker
as Shadow (uncredited)
Murray Brown
as Doctor (uncredited)
Les Conrad
as M15 Man (uncredited)
George Lane Cooper
as Pincus (uncredited)
Brenda Cowling
as Secretary (uncredited)
Robert Dorning
as Jeweller (uncredited)
Roy Everson
Nancy Gabrielle
as Manageress (uncredited)
Jill Goldston
as Commuter (uncredited)
Charlie Gray
as Tourist (uncredited)
Peter Halliday
as Customs Officer (uncredited)
Don Siegel
Director
Clive Egleton
Novel
Antony Gibbs
Editor
Peter Murton
Art Direction
Anthony Mendleson
Costume Design
Freddie Williamson
Makeup Artist
Eva Monley
Production Manager
Ousama Rawi
Director of Photography
David Brown
Executive Producer
Leigh Vance
Screenplay
Kip Gowans
Assistant Director
Scott Hale
Associate Producer
Les Wiggins
Sound Editor
Producer
Gerry Humphreys
Sound Recordist
John W. Mitchell
Richard D. Zanuck
Roy Budd
Original Music Composer
Dewi Humphreys
Focus Puller
Angela Allen
Continuity
Colin Davidson
Clapper Loader
Nobby Cross
Gaffer
Rosemary Burrows
Wardrobe Supervisor
James Devis
Camera Operator