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.
Henry Houghton
Gordon Lonsdale
Elizabeth Gee
Peter Kroger
Helen Kroger
Cmdr. Winters
Marjorie Shaw
P.O. Meadows
Captain Ray
Anderson
Christina
Captain Warner
Chief Supt. Croft
Supt. Woods
Johnnie (uncredited)
Colonel Monat (uncredited)
Police Officer (uncredited)
Surveillance Man (uncredited)
Russian Embassy Official (uncredited)
First Member at Lords (uncredited)
Second Member at Lords (uncredited)
Portland Official (uncredited)
Blake (uncredited)
News Vendor (uncredited)
Tilly (uncredited)
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