May 1915. After tragedy strikes during the Second Battle of Artois, Frenchman Julian Olivier will do anything to get out of the trenches. So when British Intelligence recruits him to spy behind enemy lines, he jumps at the opportunity. Just before he begins, however, he has a chance encounter with a young French woman who leaves him marked for the remainder of the war—even if he doesn't know her name. Warren Flynn is a Canadian airborne hero, and dogfights with the Germans are all in a day's work. Aside from the war, he's smitten with Claire Donovan, the daughter of an American munitions manufacturer living in Paris, but her father disapproves of their relationship, complicating the situation. Warren flies Julian into Germany and soon receives orders to post France's newest operative—an attractive peasant woman named Evette—in Claire's home. As a dangerous ring of spies and saboteurs threatens to turn the war against the Allies, Julian discovers goodness in his enemies' hearts. But even if he survives, will he ever be reunited with the woman whose memory he can't erase? Will Warren survive the war, and will Evette unearth the infiltrator in her own territory before it's too late?