Men from Scotland Yard and military intelligence build a dossier on a sabotage ring.

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Main Cast: Liam Redmond, André Morell, Kenneth Griffith, Anthony Bushell, Mary Morris, Joan Hickson, Anthony Nicholls, Geoffrey Keen, John Bailey, Patric Doonan

Director: Roy Boulting

Writers: Roy Boulting, Frank Harvey

Editor: Max Benedict

Cinematographer: Gilbert Taylor

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