The (O)ffice of (S)trategic (S)ervices' Cmdr. Brady (Patric Knowles) varieties Operation "Applejack" (primarily based on a composite of precise incidents throughout WWII) and sends Lt. (j.g.) Philip Masson, U.S.N.R. aka John Martin as spy Philippe Martine (Alan Ladd) together with Miss Ellen Rogers posing as her school roommate, Madame Elaine Duprez (Geraldine Fitzgerald) and Robert Bouchet, Tech Sgt., A.U.S. as Albert Bernardito (Richard Benedict) to accumulate secret Nazi plans. After almost getting caught they succeed and get new identities. Nonetheless they uncover a secret that would change the struggle and threat their lives to get the knowledge again to London earlier than it jeopardizes their lives.
