The (O)ffice of (S)trategic (S)ervices' Cmdr. Brady (Patric Knowles) forms Operation "Applejack" (based on a composite of actual incidents during WWII) and sends Lt. (j.g.) Philip Masson, U.S.N.R. aka John Martin as spy Philippe Martine (Alan Ladd) along with Miss Ellen Rogers posing as her college roommate, Madame Elaine Duprez (Geraldine Fitzgerald) and Robert Bouchet, Tech Sgt., A.U.S. as Albert Bernardito (Richard Benedict) to acquire secret Nazi plans. After nearly getting caught they succeed and get new identities. However they discover a secret that could change the war and risk their lives to get the information back to London before it jeopardizes their lives.
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| Sound | Daniele Amfitheatrof | Music |
| Production | Richard Maibaum | Producer |
| Writing | Robert Thoeren | Screenplay |
| Camera | Lionel Lindon | Director of Photography |
| Directing | Irving Pichel | Director |
| Sound | Heinz Roemheld | Music |
| Editing | William Shea | Editor |
| Art | Haldane Douglas | Art Direction |
| Art | Hans Dreier | Art Direction |
| Art | Sam Comer | Set Decoration |
| Art | Stanley J. Sawley | Set Decoration |
| Costume & Make-Up | Mary Kay Dodson | Costume Design |
| Costume & Make-Up | Wally Westmore | Makeup Supervisor |
| Directing | John Francis Murphy | Assistant Director |
| Sound | John Cope | Sound Recordist |
| Sound | Harold Lewis | Sound Recordist |
