Germany, 1945. As the ground shakes and the air raid sirens wail, Katja holds her tiny baby to her chest. She pictures Karl’s handsome face and kind blue eyes, her breath catching at the thought of him heading back to the front. She must never tell anyone about the letters she delivered for him or the other secret she is hiding....

Daisy Wilder prefers the company of horses to people, bare feet and salt water to high heels and society parties. Then, in the dizzying aftermath of the attack on Pearl Harbor, Daisy enlists in a top secret program, replacing male soldiers in a war zone for the first time. Under fear of imminent invasion, the WARDs guide pilots into blacked-out airstrips and track unidentified planes across Pacific skies. But not everyone thinks the women are up to the job, and the new recruits must rise above and work side by side despite the resistance and heartache they meet along the way.

Paris, 1943. German soldiers drag me out onto the cobbled street and push me toward the waiting truck. I force myself to face forward as tears stream down my cheeks. If I look back, they’ll know. I can’t let them find my baby girl....

1920s Germany: Though the world has changed in the wake of the Great War, it is still ruled by men. Even a woman as resourceful and intelligent as Niki Rittenhaus needs alliances in order to survive. Her marriage to Rickard Länger, a movie producer for Berlin's Passport Pictures, seems convenient for them both. When Rickard succumbs to increasing pressure from the Nazis to make propaganda movies, a horrified Niki turns away from her own film aspirations and instead, begins to write.

Berlin, 1933. Leah and Magda have been inseparable for as long as they can remember, and one beautiful summer’s day in their courtyard, they vow nothing will ever come between their friendship. But Leah could never have predicted the darkness looming just around the corner… As Hitler comes to power and the Nazi Party gain even more influence, Magda proudly tells Leah she has decided to join the Hitler Youth. Leah’s blood runs cold before she begs Magda to change her mind—because Leah is Jewish.

Paris, 1940: As the German soldiers march down the Champs-Élysées, the Bélanger twins know there is no escape – their lives are about to change forever. But while Sophie, a third-year medical student, works long days and nights saving casualties of war at the American hospital, and waits anxiously for news of her fiancé from the front line, her recently widowed twin, Adèle, is determined to enjoy her freedom. Nothing – not the bombs, the curfews or the Nazi officers sidling up to her in nightclubs – can stop her from indulging in the temptations of Parisian society.

Londoner Madeleine Grant is studying at the Sorbonne in Paris when she marries charismatic French journalist Giles Martin. As they raise their son, Olivier, they hold on to a tenuous promise for the future. Until the thunder of war sets off alarms in France. Staying behind to join the resistance, Giles sends Madeleine and Olivier to the relative safety of England, where Madeleine secures a job teaching French at a secondary school. Yet nowhere is safe. After a devastating twist of fate resulting in the loss of her son, Madeleine accepts a request from the ministry to aid in the war effort.

Ana Kaminski is pushed through the iron gates of Auschwitz beside her frightened young friend Ester Pasternak. As they reach the front of the line, Ana steps forward and quietly declares herself a midwife--and Ester her assistant. Their arms are tattooed and they’re ordered to the maternity hut. Holding an innocent newborn baby, Ana knows the fate of so many are in her hands and vows to do everything she can to save them.

When Hazel is given the chance to parachute into Nazi-occupied France, she seizes the opportunity to do more for the British war effort than file paperwork. Alongside her childhood friend, French-born Rose, she quickly rises up the ranks of the freedom fighters. For Rose, the Resistance is a link to her late husband, and a way to move forward without him. What starts out as helping downed airmen becomes a bigger cause when they meet Sophia, a German escapee and fierce critic of Hitler who is wanted by the Gestapo.

Berlin, 1930—When a wave of change sweeps a radical political party to power, Sofie von Meyer Rhodes’s academic husband benefits from the ambitions of its newly elected chancellor. Although Sofie and Jürgen do not share the social views growing popular in Hitler’s Germany, Jürgen’s position with its burgeoning rocket program changes their diminishing fortunes for the better. But as Sofie watches helplessly, her beloved Berlin begins to transform, forcing her to consider what they must sacrifice morally for their young family’s security, and what the price for their neutrality will be.

Between the World Wars, the six Mitford sisters—each more beautiful, brilliant, and eccentric than the next—dominate the English political, literary, and social scenes. Though they've weathered scandals before, the family falls into disarray when Diana divorces her wealthy husband to marry a fascist leader and Unity follows her sister's lead all the way to Munich, inciting rumors that she's become Hitler's mistress.

American Josie Anderson and Parisian Arlette LaRue are thrilled to be working in the French resistance, stealing so many Nazi secrets that they become known as the Golden Doves, renowned across France and hunted by the Gestapo. Their courage will cost them everything. When they are finally arrested and taken to the Ravensbrück concentration camp, along with their loved ones, a reclusive Nazi doctor does unspeakable things to Josie’s mother, a celebrated Jewish singer who joined her daughter in Paris when the world seemed bright. And Arlette’s son is stolen from her, never to be seen again.

Paris, 1944. “Traitor!” yells the crowd as they push me down onto a stool. “Nazi collaborator.” Tears blur my vision as the razor grazes my scalp, waves of blonde hair falling to the ground. As men paint a swastika across my face, I hold onto one small glimmer of hope. They have no idea who I am.

England, 1941: Life has always been cruel to Ethel. Raised in an orphanage by a merciless mistress, she never knew the meaning of love. And now she has fallen for the one man who is forbidden to her - Karl, a German held captive in the local prisoner-of-war camp. He might be the enemy, but he has her heart. When Ethel discovers she’s pregnant, she is labelled a traitor and shunned by all. The love of her life is torn away from her, but she vows to protect their precious daughter. But the unthinkable happens....

France, 1938. While Hitler rebuilds Germany and French and English leaders focus on appeasement, one man risks everything to smuggle information out of Munich - and into the hands of a young woman. Evelyn Ainsworth is enjoying a carefree summer with her relatives in the high society of Paris. When her father stops to visit on his way from London to Prague, she never dreams that one favor for him will change her life forever. For beneath the glittering gaiety on the continent, a menacing shadow is growing.