Present day, London: When Sophie discovers a photograph of her great aunt Vivi from World War II, it throws her into a world of confusion. Because, as she learns about this secret relative, she quickly realizes that the photograph doesn’t fit with her family’s story. It shows Vivi leaving an address associated with a spy network in London - a place she had no reason to be - and it is dated right before she disappeared.

Would you risk your life to save just one person? An incredible story of love, hope, and friendship; and a testament to humanity and courage in history’s darkest days. 1941, Nazi-occupied Amsterdam. Professor Josef Held has never recovered from the loss of his beloved wife - and has no intention of ever letting anyone new into his quiet, safe world. But then the Nazis come for the Jews - and Mrs Epstein is killed. And Josef, in an impulsive act of courage, offers his student Michael Blum a place to hide.

When an impossibly shy young woman named Judy Morgan finishes her studies in Physics at Cambridge University, it is with dreams of changing the world for the better. Meanwhile, a beautiful, young Jewish woman decides to flee her beloved Austria, changing her name to Hedy Lamarr, and risking everything to get to America, as far away from the Nazi threat as possible.

When the love of Tasha’s life, Luca, joins the air force to fight against the evil Nazi invaders, she knows she has to follow her heart—and him—into battle. Headstrong, impulsive and a daredevil, she’s the perfect recruit. Tasha’s sensible older sister, Nadia, plans only to stop Tasha’s madness and bring her home. But a chance encounter puts her in a plane, soaring above the clouds, and she also finds her calling.

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.

Sixteen-year-old Noa has been cast out in disgrace after becoming pregnant by a Nazi soldier and being forced to give up her baby. She lives above a small rail station, which she cleans in order to earn her keep. When Noa discovers a boxcar containing dozens of Jewish infants bound for a concentration camp, she is reminded of the child that was taken from her. And in a moment that will change the course of her life, she snatches one of the babies and flees into the snowy night.

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 April 1942, Lale Sokolov, a Slovakian Jew, is forcibly transported to the concentration camps at Auschwitz-Birkenau. When his captors discover that he speaks several languages, he is put to work as a Tätowierer (German for tattooist), tasked with permanently marking his fellow prisoners. Imprisoned for more than two and a half years, Lale witnesses horrific atrocities and barbarism - but also incredible acts of bravery and compassion. Risking his own life, he uses his position to exchange jewels and money from murdered Jews for food to keep his fellow prisoners alive.

1940. In a world newly burning with war, and in spite of her American family’s wishes, Virginia d’Albert-Lake decides to stay in occupied France with her French husband. She’s sure that if they keep their heads down, they’ll survive. But is surviving enough? Nineteen-year-old Violette Szabo has seen the Nazis’ evil up close and is desperate to fight them. But when she meets the man who’ll change her life only for tragedy to strike, Violette’s adrift.

From the author of The Lost Girls of Paris comes a riveting tale of courage and unlikely friendship during World War II - now a New York Times best seller.