"A British intelligence agent must track down a fellow spy suspected of being a double agent."
George Peppard
as John Shay
Joan Collins
as Sarah Booth
Judy Geeson
as Polly Bendel
Oskar Homolka
as Racovsky
Charles Gray
as Vaughan Jones
Nigel Patrick
as Colonel Scott
Keith Michell
as Adam Booth
George Baker
as Philip Crawford
Alexander Scourby
as Prof. Parker
Peter Bull
as Butterfield
Ernest Clark
as Roper
Peter Dyneley
as Balkov
Gisela Dali
as Anna
Stefan Gryff
as Shay Cell Group Surrvior
Steve Plytas
as Poilce Inspector
Charles H. Schneer
Producer
Yvonne Caffin
Costume Design
Trevor Crole-Rees
Makeup Artist
Ron Goodwin
Original Music Composer
Miriam Brickman
Casting
Sam Wanamaker
Director
Jack Pulman
Writer
Gordon McDonell
Story
Roy Watts
Editor
Peter Price
Production Manager
Denys N. Coop
Director of Photography
Edward Marshall
Art Direction
John Comfort
Alan Hall
Camera Operator
