Rhoda Middleton suspects her husband Peter is having an affair. But when Rhoda tracks the mysterious woman down, she finds she is not his lover after all, but the wife of his wartime best friend, Archie Foster. There is only one problem - Rhoda has never even heard of Archie Foster.

1941. After the death of her beloved mother, nineteen-year-old Romilly Brooks impulsively accepts a job as a nanny, accompanying eight-year-old Freddie and his grandmother on a sea voyage from war-torn London to the safety of New York. From the first, Romilly is entranced by the opulent ocean liner… if only she could put the idea of German U-boats circling beneath the waves out of her mind.

England, 1943: Deciding to throw herself into war work, Nancy Callaghan joins the Special Operations Executive in Baker Street. There, she begins solving ‘indecipherables’ – scrambled messages from agents in the field. Then Nancy meets Tom Lockwood, a quiet genius when it comes to coding. Together they come up with the idea of printing codes on silk, so agents can hide them in their clothing to avoid detection by the enemy. Nancy and Tom grow close, and soon she is hopelessly in love. But there is a traitor in Baker Street, and suspicions turn towards Tom.

It's 1944, and Rosie Sinclair is full of pride to be doing her bit for the war effort as a driver at Cottisbourne Park - the secret heart of Britain's fight against Germany, where a team of brilliant and eccentric codebreakers are battling to save the country. But when she's given a new mission to drive Major-General 'Bluff' Kingsley-Flynn down to Cottisbourne, Rosie finds herself on the frontline of a new battle - to uncover a possible spy at the Park who is jeopardising their vital work, and to resist her own growing attraction to the dashing Bluff himself.... 

When Nazis break down the front door of 18-year-old Trudi’s home and seize the Jewish couple hiding in her attic, she’s devastated, and is suddenly solely responsible for their two innocent children. The whispered rumours about the resistance are her only hope. A man called Frans and his cousin Piet risk their lives every day helping scared and abandoned Jewish children escape into the countryside. Under the cover of night, she races to beg for their help.

When Stefania Carmichael steps into the mysterious world of Bletchley Park, she immediately finds herself signing the Official Secrets Act. In whispers, she is told that she’s been recruited because of her talent for languages. Before the war ripped Europe apart, Stefania was living in Rome, charming everyone she met, and engaged to the man of her dreams, handsome and brave Matteo. And now everything has changed. With secrets swirling around the building, Stefania finds it hard to know who to trust, until she forms a close bond with two other new recruits.

Austria, 1938. After years of hardship, Ella is full of hope for a better future for Austrians, and when Hitler marches into Linz, she can’t help but become swept up in the euphoria of her boyfriend, Max. But she soon realises her mistake. When she witnesses a woman being shot in the street and a childhood friend’s Jewish department store is closed down, she knows she must do something. It’s a dangerous time to be a resistor, especially when her fascist boyfriend proposes to her.

Holding the faded postcard in her trembling hands, Mia begins to read the one story her grandmother could never tell her, revealing a secret that will change her own life forever....

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.

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?

The occupation has taken much from the Cotillard sisters, and as the Germans increase their forces in the seaside town of Boulogne-sur-Mer, Gabriella, Martine and Simone can’t escape the feeling that the walls are closing in. Yet, just as they should be trying to stay under the radar, Martine’s discovery of a British messenger pigeon leads them down a new and dangerous path. 

Pearl has given up on her dreams of being a journalist after being denied a promotion because of her gender. Joining the WAAF as a radio telephone operator for Bomber Command, Pearl's new job at RAF Fenthorpe serves two purposes – providing an income for her grandmother, and keeping a close eye on her younger sister, Thea, an instrument repairer at another Lincolnshire bomber station.

For months, Marianne’s resistance network has carried out courageous missions from a remote farmhouse in Southern Provence, aiding the Nazis’ downfall. But one fateful night, they are viciously ambushed as German soldiers storm in, scattering, capturing or killing every last person there. Mourning the loss of her friends, Marianne will need every ounce of courage to survive. Not only has her life as a secret agent been critically compromised, but her heart has been shattered. Because Jack, her darling fiancé and fellow spy, fled in the chaos–and is accused of being a traitor.

Paris, 1939. Hollywood actress Drue Leyton, married to Frenchman Jacques Tartière, lives as an expatriate in love. But when her husband is dispatched to Brittany to work as a liaison for the British military, Drue finds herself alone with her housekeeper, adrift and heartsick in her adopted city. With her career and fame forty-five hundred miles away, Drue accepts an opportunity that will change her life forever. 

When farmer’s daughter Irene meets Theodore at a village dance, sparks fly instantly. The war has brought him all the way from Louisiana to build a US airbase just across her father’s fields, but as they sway together, there is nothing else in the world. Only his gentle touch and his deep brown eyes. But being together comes at a price. As Theodore is Black, the might of the US Air Force is against them, and all the members of the little village community disapprove of their relationship. And they will all go to terrible lengths to tear the two young lovers apart....