When Louise de Bettignies’s luck finally ran out in the autumn of 1915, a young woman named Marguerite Le François was arrested with her. In the interrogation that followed over the next few hours, the Germans quickly determined that the terrified young Marguerite was no spy, merely a local girl who had foolishly allowed a friendly stranger to borrow her pass at a checkpoint. She was released, scolded, and told to go home, even as Louise was arrested and transported to prison. The historical Marguerite Le François was very probably just an innocent dupe . . . but what if she wasn’t?