Drama Crime Thriller
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.
Directed by
Robert Tronson
Written by
Frank Launder, Peter Barnes
Bernard Lee
Henry Houghton
William Sylvester
Gordon Lonsdale
Margaret Tyzack
Elizabeth Gee
Geoffrey Palmer
Police Officer (uncredited)
Garry Marsh
First Member at Lords (uncredited)
Derek Francis
Chief Supt. Croft
Bryan Pringle
Surveillance Man (uncredited)
Paul Eddington
Johnnie (uncredited)
Fred Griffiths
News Vendor (uncredited)
David Kossoff
Peter Kroger
Richard Marner
Colonel Monat (uncredited)
Basil Dignam
Second Member at Lords (uncredited)
Philip Latham
Captain Ray
Thorley Walters
Cmdr. Winters
Cyril Chamberlain
Anderson
Patrick Barr
Captain Warner
Nancy Nevinson
Helen Kroger
Hector Ross
Supt. Woods
Brian Nissen
Portland Official (uncredited)
Gillian Lewis
Marjorie Shaw
Newton Blick
P.O. Meadows
Justine Lord
Christina
Andre Mikhelson
Russian Embassy Official (uncredited)
Edwin Apps
Blake (uncredited)
Anita West
Tilly (uncredited)
Paul Sheridan

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