After the Franco-Prussian War and the siege of 1870-71, the St Clair family return to Paris, seeking refuge and security, only to be swept up into the terrible cruelties and violence of the Commune. Here their young daughter, Hélène, falls ill and, in an unlucky twist of fate, becomes separated from her family. Alone and frightened, she has to fend for herself on the war-torn streets. Meanwhile, her two brothers face each other as mortal enemies across the barricades.

It is two years before the outbreak of World War 1, and the Oakley family are typical of their time. Andrew has been clerk at a City solicitors for twenty years. Alice, his wife, keeps the home fires burning. Their sons plan on becoming skilled apprentices. And Mabel, their daughter, says she would rather die than go into domestic service like her cousin. She is going to go to train as a secretary. Andrew Oakley little imagines, as he sets off for work one February morning, that their lives are about to change in the most dramatic and tragic fashion.

Plymouth, 1941. As sirens blare all around, the Shawbrook family take refuge in a packed shelter. Bombs have already begun to fall through the night sky when they realize their infant son, Freddie, has been forgotten in the rush, left to sleep in his crib. Terrified, Vera, his young mother, races to find him and bring him to safety. The next morning, air-raid warden David Shawbrook returns from his watch to find the shelter pulverized, and his family seemingly all dead. Dirty footprints inside their home betray the looters who have rifled through the house.

Thirteen-year-old Lisa has escaped from Nazi Germany on the Kindertransport. She arrives in London unable to speak a word of English, her few belongings crammed into a small suitcase. Among them is one precious photograph of the family she has left behind. Lonely and homesick, she is adopted by a childless couple. But when the Blitz blows her new home apart, she wakes up in a hospital with no memory of who she is or where she came from. The authorities give her a new name and dispatch her to a children's home. With the war raging around her, what will become of Lisa now?

Rita and Rosie Stevens are only nine and five years old when their widowed mother marries a violent bully called Jimmy Randall and has a baby boy by him. Under pressure from her new husband, she is persuaded to send the girls to an orphanage, not knowing that the papers she has signed will entitle them to do what they like with the children. And it is not long before the powers that be decide to send a consignment of orphans to their sister institution in Australia. Among them - without their family's consent or knowledge - are Rita and Rosie.

England, 1943: Home is no longer safe for eight-year-old twins Molly and Jacob. Night after night, wailing bombs and screeching planes skim the rooftops overhead. They cradle each other, shivering in terror, not knowing if they'll live to see dawn. Their mother, Martha, has no choice but to evacuate them to the safety of the countryside. At the train station, Martha bites back tears as she says good-bye to her precious children. Knowing she might never see them again, she gives Jacob a letter, pressing the envelope into his hands and telling him to only read it if they are in danger.

Hamburg, 1942. Seventeen-year-old Anna knows she can never tell her proud parents the truth about where she is going. She must hide the fact that she is pregnant, that the father of her unborn child is dead, and that she is on her way to a special maternity home, where her baby will be given to a perfect family. She tells herself that this is the best solution. She doesn’t expect to feel the rush of love for her beautiful baby boy in the white blanket or the devastation when he is snatched from her, never to be seen again.

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.

England, 1937: After a devastating childhood at Blakely Hall Orphanage, 15-year-old Sandra is released. She finds work as a housemaid, finally able to put her past behind her. But the start of World War Two throws the country into turmoil, and her brother, Alf, is sent away to fight, leaving her completely alone. Germany, 1939: Eleven-year-old Frieda is about to board a ship bound for England with her brother, Kurt. But at the last moment, as Frieda stands on the deck crammed with frightened children, she spots her brother jumping off, back to land.

As the war begins, Hanna Rombauer, a young German woman, is sent to live with her aunt and uncle after her mother’s death. Thrown into a life of luxury she never expected, Hanna soon finds herself unwillingly matched with an SS officer twenty years her senior. The independence that her mother lovingly fostered in her is considered highly inappropriate as the future wife of an up-and-coming officer and she is sent to a “bride school.” There, in a posh villa on the outskirts of town, Hanna is taught how to be a “proper” German wife.

Growing up in New York City in the 1910s, Luella and Effie Tildon realize that even as wealthy young women, their freedoms come with limits. But when the sisters discover a shocking secret about their father, Luella, the brazen elder sister, becomes emboldened to do as she pleases. Her rebellion comes with consequences, and one morning Luella is mysteriously gone.

Germany, 1939. A tumbledown farmhouse, on the outskirts of a close-knit village in the heart of the rolling hills of Bavaria. A once happy family home torn apart by Nazi rule. And one young girl who refuses to give up on what she believes in...London, 2018: When 94-year-old Imogen receives a letter addressed to her in neat, unfamiliar handwriting, she notices the postmark is stamped from Germany - and it sends shivers down her spine....

At 97 years old, Winnifred Ellis knows she doesn’t have much time left, and it is almost a relief to realize that once she is gone, the truth about her shameful past will die with her. But when her great-grandson Jamie, the spitting image of her dear late husband, asks about his family tree, Winnifred can’t lie any longer, even if it means breaking a promise she made so long ago....

Elise Sontag is a typical Iowa 14-year-old in 1943 - aware of the war but distanced from its reach. Then her father, a legal US resident for nearly two decades, is suddenly arrested on suspicion of being a Nazi sympathizer. The family is sent to an internment camp in Texas, where behind the armed guards and barbed wire, Elise feels stripped of everything beloved and familiar, including her own identity. The only thing that makes the camp bearable is meeting fellow internee Mariko Inoue, a Japanese-American teen from Los Angeles.

In 1950s Quebec, French and English tolerate each other with precarious civility - much like Maggie Hughes' parents. Maggie's English-speaking father has ambitions for his daughter that don't include marriage to the poor French boy on the next farm over. But Maggie's heart is captured by Gabriel Phénix. When she becomes pregnant at 15, her parents force her to give baby Elodie up for adoption and get her life "back on track".