A professor teaching at a correspondence school discovers that a Nazi agent is trying to prevent a trade treaty being signed between England and South America.
| Directing | Will Hay | Director |
| Directing | Basil Dearden | Director |
| Production | John Croydon | Production Manager |
| Crew | Günther Krampf | Cinematography |
| Writing | Angus MacPhail | Original Story |
| Production | Michael Balcon | Producer |
| Sound | Ernest Irving | Music Director |
| Writing | John Dighton | Screenplay |
| Editing | Ray Pitt | Editor |
| Writing | Angus MacPhail | Screenplay |
| Art | Thomas N. Morahan | Art Direction |
| Writing | John Dighton | Original Story |
| Camera | Eric Cross | Director of Photography |
