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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.
Featured Crew
| Anatole de Grunwald | Screenplay |
| Geoffrey Kerr | Theatre Play |
| Anthony Asquith | Director |
| J.O.C. Orton | Screenplay |
| Louis Levy | Music |
| Charles Williams | Music |
| Edward Black | Producer |
| R. E. Dearing | Editor |
| Jack E. Cox | Director of Photography |