World Wars are won on many fronts, and not only the ones that include battle. The war that was raged by the intelligence agencies is one that was secret during the war, but after we got to see the bravery normal people put to push the allied forces to success. This included women who worked in enemy territory as spies. One of the famous ones was the story of Odette.
When the call is made for holiday photographs from France to be sent to the intelligence agencies, Odette (Anna Neagle), a French woman living in France provides some. When the Special Operations Executive contact her, she decides to help them by being flown into Occupied France where she fought for the French resistance.