Set just before the outbreak of WWII, this is the story of a test pilot who works for the (unnamed) enemy. Made in 1939, by the time it was released in 1940, war had been declared.
| Actor | Role |
|---|---|
 Barry K. BarnesPeter Thurloe | Peter Thurloe |
 Joan MarionDorothy Houghton | Dorothy Houghton |
 Roger LiveseyCharles Houghton | Charles Houghton |
 Basil RadfordBill Madison | Bill Madison |
 Everley GreggEmily Madison | Emily Madison |
 Felix AylmerCol. Cairns | Col. Cairns |
| WWallace DouglasAgent Hooper | Agent Hooper |
 Henry OscarPorter | Porter |
 John TurnbullSir Andrew Hamilton | Sir Andrew Hamilton |
 Edward AshleyStuart | Stuart |
| SSantos CasaniForeigner | Foreigner |
| HHal WaltersKingswell | Kingswell |
 David DaviesDetective (uncredited) | Detective (uncredited) |