The film is based on the actual events of the Portland Spy Ring trial in the U.K. A disgruntled Navy Clerk is transferred to a secret research establishment and is subsequently black-mailed/paid by Czech intelligence to procure secrets for them. He seduces the secretary who controls the most secret documents, and they enjoy the fruits of their treachery until the British authorities begin to close in on them.
Cast
Bernard Lee
Henry Houghton
William Sylvester
Gordon Lonsdale
Margaret Tyzack
Elizabeth Gee
David Kossoff
Peter Kroger
Nancy Nevinson
Helen Kroger
Thorley Walters
Cmdr. Winters
Gillian Lewis
Marjorie Shaw
Newton Blick
P.O. Meadows
Philip Latham
Captain Ray
Cyril Chamberlain
Anderson
Justine Lord
Christina
Patrick Barr
Captain Warner
Derek Francis
Chief Supt. Croft
Hector Ross
Supt. Woods
Paul Eddington
Johnnie (uncredited)
Richard Marner
Colonel Monat (uncredited)
Geoffrey Palmer
Police Officer (uncredited)
Bryan Pringle
Surveillance Man (uncredited)
Andre Mikhelson
Russian Embassy Official (uncredited)
Garry Marsh
First Member at Lords (uncredited)
Basil Dignam
Second Member at Lords (uncredited)
Brian Nissen
Portland Official (uncredited)
Edwin Apps
Blake (uncredited)
Fred Griffiths
News Vendor (uncredited)
Anita West
Tilly (uncredited)
Crew
Robert Tronson
Director
Peter Barnes
Writer
Frank Launder
Writer
Thelma Connell
Editor
Arthur Lavis
Director of Photography
Derek Cracknell
Assistant Director
Leslie Gilliat
Producer
Jack Lowin
Camera Operator
Paul Sheridan
Casting
Daphne Vollmer
Hairdresser
Ernest Gasser
Makeup Artist
Cecil Mason
Sound Recordist
Norman G. Arnold
Art Direction
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