Allied spies and Nazi Agents insinuate themselves at a Scottish cottage (converted to a wartime hospital) with interests on an inventor's nearly perfected bomb sight.

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Main Cast: Leslie Banks, Jeanne De Casalis, Carla Lehmann, Alastair Sim, John Mills, George Cole, Michael Wilding, Frank Cellier, Muriel Aked, Wally Patch

Director: Anthony Asquith

Writers: J.O.C. Orton, Anatole de Grunwald

Editor: R. E. Dearing

Cinematographer: Jack E. Cox

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