In the quiet town of Houghton, Michigan, sixteen-year-old Nancy Harkness discovers a passion that ignites her heart in ways she never expected. The arrival of barnstormer pilots brings more than just the thrill of their daring stunts; it brings the promise of adventure. Nancy vows she will be a pilot someday. Years later, as the dark clouds of World War II gather on the horizon, Nancy’s dreams take a new and daring turn. With unwavering determination, she envisions a squadron of female pilots. Yet, her path is far from clear.

Riga, 1943. Cycling the streets to deliver fresh loaves, Zenta passes empty houses, curtains open, doors unlocked, their occupants forced out by Russian or German hands. Above the newly built town hall, a Nazi flag waves in the breeze. Since her brother became a soldier and her sister joined the resistance, Zenta is all her parents have left. Then one morning her sister returns. Tired, worn, with a newly rounded belly, Estere is as determined as ever to fight for their freedom.

Auschwitz, 1942: Her entire body trembles as she stands in the infirmary and realises the horrifying truth. She’s a nurse, but instead of saving her fellow inmates, she’s about to be ordered to kill them… Surrounded by thick fog from the nearby forest, Orli stumbles from the cattle truck onto the frostbitten grounds of Auschwitz. Betrayed by her own husband for being a German resistance fighter, she has no one left in the world, and this is now her home.

As Mira is nearing the end of her life, her daughter Rachelle wants to find out how her mother had lived through four concentration camps, including Auschwitz, and a Death March. There was a mystery to her survival, it seemed—which perhaps had something to do with the strange things that always happened around her. And, incredibly, when giving testimony later in life, she says that it was during this time—despite witnessing the depths of man’s cruelty—that she learned about “the goodness of people.”

Sicily, 1943. Three American women, all nurses in the Medical Air Evacuation Transport Squadron, are determined to do all they can for their country. Vita is fun-loving, Dot shy and sweet-natured, and Evelyn practical and determined, but for all their differences, a life of military service pulls the three together as firm friends. When they’re selected for a daring mission, the women are proud to play their part. But disaster strikes when their plane crash-lands behind enemy lines in occupied Albania. finally find their way home?

Berlin, 1944: Amira and Gisele have been best friends since they were children, and now Gisele is the only person who knows Amira’s secret. A secret that puts her and everyone she loves in unimaginable danger amid the daily horror and violence of Nazi Germany. With the threat of exposure drawing closer, Gisele’s suggestion that Amira marries her friend Fred, a famous pianist, might just be the lifeline she needs to keep them both safe. Because Fred has secrets too.

Berlin, 1942. "All I know is we will survive this together," he says before kissing the tears away from my cheeks. But I know if the Nazis discover what we’ve done, how we’ve conspired against them, we will die together. Deaf since the age of five, Mina has had to fight for everything she has, including her place at an Austrian university to study physics. She has never felt accepted—until she meets fellow student Siggy, and her heart stops at the kindness in his bright blue eyes.

Morocco, 1941. With France having fallen to Nazi occupation, twelve-year-old Josie has fled with her family to Casablanca, where they await safe passage to America. Life here is as intense as the sun, every sight, smell and sound overwhelming to the senses in a city filled with extraordinary characters. It’s a world away from the trouble back home—and Josie loves it. Seventy years later, another new arrival in the intoxicating port city, Zoe, is struggling—with her marriage, her baby daughter and her new life as an expat in an unfamiliar place.

Nineteen-year-old Libby moves to Berlin to escape her suffocating family - but instead of offering freedom, the city is under siege by the Nazis. Jewish books are burned, storefronts smashed and every day innocent people vanish into thin air. Libby cannot - will not - turn a blind eye. When Libby meets Harro, she knows there’s more to him than his dazzling smile and cornflower-blue eyes. The whip marks on his back, scars from the SS, tell his true story: He is a resistance fighter.

In the 1930s, Germany was a hotbed of scientific thought. But after the Nazis took power, Jewish and female citizens were forced out of their academic positions. Hedwig Kohn, Lise Meitner, Hertha Sponer and Hildegard Stücklen were eminent in their fields, but they had no choice but to flee due to their Jewish ancestry or anti-Nazi sentiments. Their harrowing journey out of Germany became a life-and-death situation that required Herculean efforts of friends and other prominent scientists.

Paris, 1942. As the Germans occupy the city she calls home, Adele Basset is determined to keep her pupils' spirits up. Their dance class offers a moment of solace in the dark days of occupation. But when the Germans demand the names of her Jewish students, Adele is spurred into action. She can't stand silent while they're taken from her. Hiding her Jewish pupils in the school attic, Adele puts her life on the line in search of an escape.

On a freezing night in January 1941, a little Jewish girl is found on the steps of an apartment building in Bucharest. With Romania recently allied with the Nazis, the Jewish population is in grave danger, undergoing increasingly violent persecution. The girl is placed in an orphanage and eventually adopted by a wealthy, childless couple who name her Natalia. As she assimilates into her new life, she all but forgets the parents who were forced to leave her behind. They are even further from her mind when Romania falls under Soviet occupation.

Occupied France, 1940. When the staff at a field hospital draw straws to find out who will join the evacuation from Dunkirk, Nurse Cate is left behind. But when the Nazis arrive to claim prisoners of war, she takes her chance and flees into the night, taking one patient with her. Fifty miles away, the surrendering soldiers of the Royal Norfolk Regiment are shot dead by the advancing Germans. Beneath the pile of bodies two men survive, crawling to the safety of a nearby farmhouse, where sisters Elise and Adelaide risk their lives to take them in.

In 1946, Eva leaves behind the rubble of Berlin for the streets of New York City, stepping from the fiery aftermath of one war into another, far colder one, where power is more important than principles and lies are more plentiful than the truth. Eva holds the key to a deadly secret: Project Bluebird - a horrific experiment of the concentration camps, capable of tipping the balance of world power. Both the Americans and the Soviets want Bluebird, and it is something that neither should ever be allowed to possess.

London, 1944. Two young nurses meet at a train station with a common purpose: to join the war effort. Scarlet longs for the chance to find her missing fiancé, Thomas, and to prove to her family - and to herself - that she's stronger than everybody thinks. Nursing is in Ellie's blood, but her humble background is vastly different from Scarlet's privileged upbringing. Though Ellie puts on a brave face, she's just as nervous as Scarlet about what awaits them in France.