For Stella Bled Lawrence, being wealthy and stylish in 1938 is exactly what it's cracked up to be. She's blissfully unaware of the rising tensions in Europe even as she travels to Vienna on the eve of the Kristallnacht, the Night of Broken Glass. Stella and her husband, Nicky, witness the night's atrocities firsthand. Even as they watch the horror, they never imagine it will touch them personally, a pair of wealthy Americans on their honeymoon, but touch them it does.

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.

Twenty-five years after the end of the war, Noah Ainsworth is still preoccupied with those perilous, exhilarating years as a British SOE operative in France. A head injury sustained on his final operation has caused frustrating gaps in his memory—in particular about the agent who saved his life during that mission gone wrong, whose real name he never knew, nor whether she even survived the war.

It's not just a thousand miles that separates Hanna Majewski from her younger sister, Stefa. There is another gulf—between the traditional Jewish ways that Hanna chose to leave behind in Warsaw, and her new, independent life in London. But as autumn of 1940 draws near, Germany begins a savage aerial bombing campaign in England, killing and displacing tens of thousands. Hanna, who narrowly escapes death, is recruited as a spy in an undercover operation that sends her back to her war-torn homeland.

In enemy-occupied Paris, as the locals go to bed starving and defeated by the war, music and laughter spills through the door of a little restaurant, crowded with German soldiers. The owner, Marianne, moves on weary feet between its packed tables, carrying plates of steaming, wholesome food for the enemy officers. Her smile is bright and sparkling, her welcome cordial. Nobody would guess the hatred she hides in her heart. That night, the restaurant closes its doors for the final time.

Juliette and her husband have finally made it to France on the romantic getaway of her dreams—but as the days pass, all she discovers is quite how far they’ve grown apart. She’s craving a new adventure, so when she happens across a tiny, abandoned shop with a for-sale sign in the window, it feels fated. And she’s about to learn that the forgotten bookshop hides a lot more than meets the eye.

At the end of her first unsuccessful season out in society, Lady Georgiana has all but given up on attracting a suitable man - until she receives an invitation to a masked Halloween ball at Broxley Manor. Georgie is uncertain why she was invited, until she learns that the royal family intends to marry her off to a foreign prince, one reputed to be mad.

July, 1940. Blitz-ridden London: Marnie Fern’s life is torn apart when her grandfather is killed in an air raid. But once she discovers that he’d been working undercover as a radio operative – or pianist – for the Dutch resistance, Marnie knows she must complete his mission – no matter the cost. Nazi-occupied Amsterdam: At the other end of the wireless, fellow pianist Corrie Bakker is caught in a dangerous game of cat-and-mouse as she desperately tries to keep her loved ones out of the line of fire – even if it means sacrificing herself.

1942. Hannah Martel has narrowly escaped Nazi Germany after her fiancé was killed in a pogrom. When her ship bound for America is turned away at port, she has nowhere to go but to her cousin Lily, who lives with her family in Brussels. Fearful for her life, Hannah is desperate to get out of occupied Europe. But with no safe way to leave, she must return to the dangerous underground work she thought she had left behind.

In a remote corner of France, Jewish refugee Ella Rosenthal has finally found a safe haven. It has been three years since she and her little sister, Hanni, left their parents to flee Nazi Germany, and they have been pursued and adrift in the chaos of war ever since. Now, they shelter among one hundred other young refugees in a derelict castle overseen by the Swiss Red Cross.

1997. Amy Novak has lost the two great loves in her life: her husband, Michael, and her first love, music. With the first anniversary of Michael's death approaching, Amy buries herself in her job as an archivist. And when a newly declassified file lands on her desk, she is astonished to uncover proof that Agent 'Colette' existed—a name spoken only in whispers; an identity so secret that it has never been verified.

England, 1939: The Penrose sisters couldn't be more different. Skye is a daring and brash pilot, and Liberty is the one to defy her at every turn. Even if women aren't allowed in the Royal Air Force, Skye is determined to help the war effort. She's thrilled when it reunites her with her childhood soul mate, Nicholas. She's less thrilled to learn Nicholas is now engaged to an enigmatic Frenchwoman named Margaux Jourdan.

It was a misty Wednesday morning. Inside the Gestapo headquarters, you could cut the tension with a knife. There was a traitor in their midst: Someone had leaked a list of the SS to the British press. The head of the Gestapo called me into his office. Panelled oak walls, a grand piano in the corner, rugs lining the floor—the place where he ordered executions every day.

As bombs fall across Europe, fourteen-year-old Lien Vinke fears that the reality of war is inescapable. Though she lives a quiet life with her mother and older sister, Elif, in their small town of Haarlem, they are no strangers to heartache, having recently suffered an immeasurable loss. And when the Nazis invade the Netherlands, joining the Dutch resistance with Elif offers just the atonement Lien craves.

Molly Murphy always knew she'd end up in trouble, just as her mother predicted. So, when she commits murder in self-defense, she flees her cherished Ireland, under cover of a false identity, for the anonymous shores of late 19th-century America. When she arrives in New York and sees the welcoming promise of freedom in the Statue of Liberty, Molly begins to breathe easier. But when a man is murdered on Ellis Island, a man Molly was seen arguing with, she becomes a prime suspect in the crime.