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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Leslie Banks as John Barrington
Jeanne De Casalis as Mrs. Barrington
Carla Lehmann as Helen Barrington (as Carla Lehman)
Alastair Sim as Charles Dimble
John Mills as Flt·Lieut. Perry
George Cole as Ronald
Michael Wilding as Alan Trently
Frank Cellier as John Forest
Muriel Aked as Miss Fernery
Wally Patch as Evans
Muriel George as Mrs. Trimm
Hay Petrie as Dr. Truscott
Catherine Lacey as Mrs. Stokes
Annie Esmond as Lady Wrapping Parcels For The Bazaar (uncredited)
Peter Gawthorne as Senior RAF Officer (uncredited)
Arthur Hambling as Scotland Yard Inspector (uncredited)
Roddy Hughes as German Agent (uncredited)
Sydney King as Ministry Official (uncredited)
Brefni O'Rorke as Scottish Police Inspector (uncredited)