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.
Trailer
Cast
Leslie Banks
(John Barrington)
Jeanne De Casalis
(Mrs. Barrington)
Carla Lehmann
(Helen Barrington (as Carla Lehman))
Alastair Sim
(Charles Dimble)
John Mills
(Flt·Lieut. Perry)
George Cole
(Ronald)
Michael Wilding
(Alan Trently)
Frank Cellier
(John Forest)
Muriel Aked
(Miss Fernery)
Wally Patch
(Evans)
Muriel George
(Mrs. Trimm)
Hay Petrie
(Dr. Truscott)
Catherine Lacey
(Mrs. Stokes)
Annie Esmond
(Lady Wrapping Parcels For The Bazaar (uncredited))