Yorkshire Dales, 1850. As a terrible storm rages, Annabelle Wallis is shocked to find a distressed young woman at her cottage door, heavy with child. Moments later a baby girl is born. But by dawn, the mother has vanished, leaving behind the helpless child wrapped only in a silk peacock shawl. When news spreads that Lady Eliza Hartley, sister to a wealthy estate owner, has been found dead, Annabelle realises the terrible secret she has stumbled on. Terrified she’ll be blamed for Eliza’s death, Annabelle flees to the slums of York, where she plans to raise the orphan as her own.

Paris 1930s. Childhood companions Fleur and Colette make a vow, under the trailing ivy of their secret garden, that they will be secret sisters forever. But as they grow up, the promises of childhood are put to the ultimate test. For Colette is the daughter of the house, and her life is all jazz clubs, silk dresses and chilled champagne, while Fleur is the orphan niece of the housekeeper and doesn’t feel like she belongs anywhere. Years later, in 1939, life as they know it will never be the same.

Born to a French mother and an English father, Charlotte Bray has always felt like an outsider in her Cornish fishing village. She spends her days on her father's fishing boat, helping to feed a nation at war. But the war brings devastation, and her world is forever changed by tragedy. With nothing left to lose, she accepts a mysterious invitation to work for the War Office as a spy. She soon finds herself in Nazi-occupied Paris with a new identity. Charlotte begins working under the sombre but handsome Frenchman Pierre Lesieur. But do his allegiances lie elsewhere?

1945. The tiny bundle in her arms barely stirs as she hurries out into the dark street. Remembering Villa Teresa, a thousand miles away in sun-soaked Italy, Betty thinks of the letter she had to write to stop the bombing and save Gianni. Instead, it cost her everything, and she will never see her beloved again. Letting her little baby go will tear her apart, but she knows it is the only way to keep her child safe.

For 500 years we've been looking at the Mona Lisa, and it turns out that she's been looking right back at us. Over the centuries, few could hear her voice, but now we are let into the secret, as she tells us her story in her own words - a tale of rivalry, murder and heartbreak. And a mystery of Leonardo's greatest lost painting. Weaving through the years, she takes us from the dazzling world of da Vinci's Florentine studio to the French courts at Fontainebleau and Versailles, and into the 20th century.

For Iris, each visit to her mother in St Mabon’s Cove, Cornwall has been the same—a serene escape from the city. But today, as she breaths in the salt air on the doorstep of her beloved childhood home, a heavy weight of anticipation settles over her. Iris knows she’s adopted, but any questions about where she came from have always been shut down by her parents, who can’t bear to revisit the past. Now, Iris can’t stop thinking about what she’s read on the official paperwork: BABY GIRL, FRANCE, 1939 – the year war was declared with Nazi Germany.

Working in the camp’s munitions factory, Adela Rubenstein discovers the underground network fighting against the devastating cruelty all around them. Imprisoned for teaching Jewish orphans in secret for the resistance, she doesn’t hesitate to join the rebellion. Every night on the way back to her hut, she looks up at the stars, the only witness to their plan to blow up the crematoria buildings.

When Sophie Weiss boards the SS St Louis, she has no reason to stay in Germany. The Nazis have taken everything from her, and her only hope is escape. But when she meets fellow Jewish refugees Rosa, Hannah and Rachel on board, the friendship they form gives Sophie hope that there can be happiness in her future, after all.

When Georgie, Iris and Nola's mother died and their father disappeared into his grief, the sisters made a pact: they would always be there for one another, no matter what. Now, decades later, they haven't spoken for years and can barely stand to be in the same room. As his health declines, their father comes up with a plan. In his will, he states that before they can claim their inheritance, they must spend six months living together in their childhood home in the village of Ballycove, Ireland, and try to repair their broken relationships.

The war is over, and Germany in ruins. Posted to an Allied-run Hamburg, reporter Georgie Young returns to the country she fled seven years prior – at the onset of the conflict – to find it unrecognisable. Amidst the stark horrors of a bombed-out city crumbling under the weight of millions of displaced souls, she discovers pockets of warmth: a violinist playing amidst the wreckage, couples dancing in the streets, and a nation trying to make amends.

1943. Lidia De Angelis has kept a low profile since Mussolini’s laws wrenched her from her childhood sweetheart. But when the Germans occupy Venice, she must flee the city to save her life. Lidia joins the partisans in the Venetian mountains, where she meets David, an English soldier fighting for the same cause. As she grows closer to him, harsh German reprisals and her own ardent patriotic activities threaten to tear them apart.

Claire has always had a special bond with her aunt Margaret, but she’s astonished when Margaret suddenly begins talking about a friend called Agnes, who Margaret met working as a WAAF in World War 2 – a past Claire had no idea about. Margaret and Agnes were best friends until Agnes started acting strangely, becoming secretive and distant. Then one morning, Agnes vanished and never returned home, leaving Margaret distraught. Claire promises to delve back into the past and help discover what happened to Agnes. 

In 1929, Katya is 16 years old, surrounded by family and in love with the boy next door. When Stalin’s activists arrive in her village, it’s just a few, a little pressure to join the collective. But soon neighbors disappear, those who speak out are never seen again and every new day is uncertain. Resistance has a price, and as desperate hunger grips the countryside, survival seems more a dream than a possibility. But, even in the darkest times, love beckons. Seventy years later, a young widow discovers her grandmother’s journal.

New York City, 1926. Nurse Althea Anderson's heart is near breaking when she witnesses another premature baby die at Bellevue Hospital. So when she reads an article detailing the amazing survival rates of babies treated in incubators in an exhibit at Luna Park, Coney Island, it feels like the miracle she has been searching for. But the doctors at Bellevue dismiss Althea and this unconventional medicine, forcing her to make a choice between a baby's life and the doctors' wishes that will change everything. 

Working in a museum under a false identity is Brigitte’s only hope. Until she meets Isabelle Valette, who confides in hushed tones that she is part of the Resistance. And when her new friend tells her of a train leaving Paris that can take children to safety, Brigitte knows her daughter must be on it, even if it breaks her heart. But getting Sophie onto the train is dangerous. If they are caught smuggling a Jewish child out of Paris, they will be killed. And with the enemy closing in, can Brigitte get her beloved daughter to safety before it is too late?