Sometimes, the deadliest enemy lies within. It is 1942, and war is raging in Europe. Monika Ritter is in New York with her husband, Michael. Haunted by memories of her childhood in Germany and her father’s death at the hands of the Nazis, she longs to do her bit against Hitler’s rampaging armies. When Michael joins the new Army Air Force as a bomber pilot, Monika takes advantage of an invitation she receives to join the OSS, a fledgling group of spies with the mission to turn the war by gathering the most vital asset of all—information.

Paris, 1940 German tanks rumble through the streets of Paris, forcing frightened citizens to flee. But not everyone has the luxury to leave. Camille Lacroix, a chambermaid at the world-famous Hôtel Ritz, must stay to support her family back home in Brittany. Desperate to earn money, Camille also acts as a lady’s maid for longtime guest Vivian Miller, a glamorous American widow—and a Nazi sympathizer. Despite her distrust of the woman, Camille turns to Vivian when her friend Rachel Berman needs help getting out of Paris. It’s then that Camille discovers that Vivian is not what she seems.

Ania hears the explosion of gunshots before she sees the Nazi soldiers approach her beloved home. Her family don’t have time to run, but she does. Hiding nearby, she listens to her sister’s screams and – stroking the red ribbon she keeps tied around her wrist – she begins to plot her revenge… Taunted her whole life for being smarter than anyone else in the village, now living in war-torn Poland, being governed by Nazis who think Poles are subhuman and women only good for one thing… Ania now only has her wits to rely on, if she's going to survive.

Berlin, 1944. ‘It is a great honour to have you here, Herr Hitler.’ Lili doesn’t stumble over the lie, her hand steady as she pours champagne. Everything must be perfect, no one can suspect a thing… Lili Rodenberg and her husband Marius run the Edel, Berlin’s most glamorous hotel. For its wealthy guests, it is an escape from the destruction outside, with its elegant piano bar and fine amber brandy. But Lili is Jewish, a secret she is terrified will end in tragedy for her and their beloved little girl.

Teddy’s job is to process visa applications, and by 1939, refugees from Nazi-conquered Poland, Austria, and other countries are desperate to secure safe passage to America. As Hitler sweeps through France, Belgium, Luxembourg, Denmark, and Holland, the screws tighten and law after virulent law is passed to threaten the lives, indeed the very existence of the Jewish people. When Teddy and his girlfriend Sara are introduced to an orphaned young girl named Katy, who has been abandoned on the grounds of a nursery school, they agree to adopt her.