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.

Cleo Jaffray was an American. A war in Europe had nothing to do with her. She told herself that right up until the man she loved went missing in Poland and Cleo was forced to turn to the only person who might be able to help—her aunt Daisy, the US Minister to Norway. Daisy Harriman has never shied away from a challenge, be it canvassing for women’s suffrage or driving Red Cross ambulances in WWI, so as only the second woman ambassador, she is determined to prove the naysayers wrong and succeed in her post.

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.

1940, England: Evelyne Redfern, known as “The Parisian Orphan” as a child, is working on the line at a munitions factory in wartime London. When Mr. Fletcher, one of her father’s old friends, spots Evelyne on a night out, Evelyne finds herself plunged into the world of Prime Minister Winston Churchill’s cabinet war rooms. However, shortly after she settles into her new role as a secretary, one of the girls at work is murdered, and Evelyne must use all of her amateur sleuthing expertise to find the killer.

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.

Paris, 1940. The Nazis have occupied the city - and the Ritz. The opulent old hotel, so loved by Parisians, is now full of swaggering officers, their minions and their mistresses. For American Olivia Olsen, working as a chambermaid at the hotel means denying her nationality and living a lie, every day bringing the danger of discovery closer. When Hitler’s right-hand man moves in and makes her his pet, she sees an opportunity to help the Resistance - and draw closer to Jack, her contact, whose brusque instructions may be a shield for something more....

When Marie Waite notices discrepancies in cargo, she insists on accompanying her husband, Charlie, on a run. There, not only does Marie witness her husband's shortcomings, but she becomes enthralled by Cleo Lythgoe, "The Bahama Queen," who announces her retirement. Marie knows an opportunity when she sees it, and she wants the crown for herself so badly she can taste it.

In Nottingham, England, widow Emma Taylor finds herself in desperate need of a job. She and her beloved daughter Olivia have always managed just fine on their own, but with the legal restrictions prohibiting widows with children from most employment opportunities, she’s left with only one option: persuading the manageress at Boots’ Booklover’s Library to take a chance on her with a job.

Java Island, 1941. Six-year-old Rita Vischer cowers in her family’s dug-out bomb shelter, listening to the sirens and waiting for a bomb to fall. Her charmed life on Java—living with other Dutch families—had always been peaceful, but when Holland declares war on Japan and the Japanese army invades Indonesia, Rita’s family is forced to relocate to a POW camp, and Rita must help care for her little brother, Georgie.

Following the death of her husband, Lady Darby has taken refuge at her sister's estate, finding solace in her passion for painting. But when one of the house guests is murdered, her brother-in-law asks her to aid the insufferable Sebastian Gage - a fellow guest with some experience as an inquiry agent. While Gage is clearly more competent than she first assumed, Kiera isn't about to let her guard down, as accusations and rumors swirl.

France, March 1944. Virginia Hall wasn't like the other young society women back home in Baltimore - she never wanted the debutante ball or silk gloves. Instead, she traded a safe life for adventure in Europe, and when her beloved second home is thrust into the dark days of war, she leaps in headfirst. Once she's recruited as an Allied spy, subverting the Nazis becomes her calling. But even the most cunning agent can be bested, and in wartime trusting the wrong person can prove fatal.

London, 1962: The world is teetering on the brink of nuclear war but life must go on. Celia Duchesne longs for a career, but with no means or qualifications, passes her time working at a dusty bookshop. The day a handsome American enters the shop, she thinks she might have found her way out of the monotony. Just as the excitement of a budding relationship engulfs her, a devastating secret draws her into the murky world of espionage.

August 1942. Jacob and Moses Stein, two young Jewish brothers, are staying with their aunt in Paris amid the Nazi occupation. The boys’ parents, well-known German playwrights, have left the brothers in their aunt’s care until they can find safe harbor for their family. But before the Steins can reunite, a great and terrifying roundup occurs. The French gendarmes, under Nazi order, arrest the boys and take them to the Vélodrome d’Hiver - a massive, bleak structure in Paris where thousands of France’s Jews are being forcibly detained.

Tuscany, 1943. Stranded in war-ravaged Italy, Beatrice’s dream of an escapist year teaching English is shattered. Granted shelter at the Villa delle Colombe, she seeks refuge in Francesca and Edoardo’s beautiful walled garden, hidden from the outside world, with an elaborate cypress maze at its heart. But Beatrice is not the only one seeking an escape here. Francesca has brought children to the safety of the house, as well as other adults, all of them seeking sanctuary on the estate with its mysterious maze.

Inspired by the extraordinary true stories of World War II’s American Army nurses famously known as the Angels of Bataan and the unsung contributions of Filipinas of the resistance, this novel transports us to a remarkable era of hope, bravery, perseverance, and ultimately—victory.