Gracie Thompson has a job, a loving family, a twin brother who drives her insane and a great friend. A chance meeting introduces her to the love of her life. But the storm clouds are gathering, Europe is teetering on the verge of war and threatening to destroy everything Gracie holds dear. When war arrives her family are split up, her younger siblings evacuated, her brothers join up to serve, her boyfriend, Charlie, is in daily danger and her life is threatened.

1852 Illinois. Eva Thompson has her future mapped out. Marriage to David Clarke and a family is all she wants. Her Pa has other ideas. He insists on taking the Oregon Trail to a better life and favors Harold Chapman as Eva's suitor. Marriage to Harold will provide Eva with everything she needs except . . . love.

I sent 19-year-old Phyllis, my youngest recruit, into a city crawling with enemy soldiers. And this beautiful house on a tree-lined street, the headquarters of cold-hearted German soldiers, was the last place she was seen. I trail my fingers along the gilded furniture and see the light dance off the glittering chandeliers. On the top floor, I find the dates inscribed by beaten prisoners, and I know my girl was shown no mercy.

Germany 1939 – To save her baby, Trudi Beck must hand her over to strangers who will take her across the sea to a foreign country. Trudi has already lost her husband to the Nazis, her stepsons are taking the train too. Walking away from the train station with empty arms is the hardest thing she's ever done. London 1939 – Newly married, Sally Matthews, is alone again. Her husband is away training for war, leaving her days and home empty. She volunteers to help with the children from the Kindertransport, becoming captivated by five-year-old Tom and his baby sister, Liesel.

Paris, 1943. German soldiers drag me out onto the cobbled street and push me toward the waiting truck. I force myself to face forward as tears stream down my cheeks. If I look back, they’ll know. I can’t let them find my baby girl....

Bridget Collins is in dire straits - she needs to get out of New York, fast. With two young siblings under her wing, her options are limited. Her priest sends her as an outplacement agent on the orphan trains that run from New York to out west. With almost 40 orphans under her care, she's relieved that fellow and more experienced outplacement agent Carl Watson is there to guide her. But Carl is dealing with his own trauma and finds it difficult to handle the pain the orphans are dealing with.

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.

1920s Germany: Though the world has changed in the wake of the Great War, it is still ruled by men. Even a woman as resourceful and intelligent as Niki Rittenhaus needs alliances in order to survive. Her marriage to Rickard Länger, a movie producer for Berlin's Passport Pictures, seems convenient for them both. When Rickard succumbs to increasing pressure from the Nazis to make propaganda movies, a horrified Niki turns away from her own film aspirations and instead, begins to write.

1940. Cora Mayhew came to Paris to search for her birth mother and stayed to work for the resistance movement. When Cora's train is struck by Nazi bombs, the only thoughts on her mind as she staggers from the wreckage are to escape to return to her family, and to post the heart-wrenching letter clutched in her hand. Then a German soldier finds and saves Cora. Max Heller is nothing like she would have expected: kind, good-humoured and selfless. Cora can't help falling in love with him as he helps to plot her escape.

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.

1942. When Helda Dahlstrøm flees her abusive husband and Nazi-occupied Norway with her eight-year-old son she doesn't know if they'll make it out alive. In her desperate journey to safety she'll find safety on the rocky shores of the Shetland Islands, rescued by Canadian Flight Sergeant Bill Gauthier. As WWII's destruction rages at their doorsteps, can love find its way through the rubble?

Amsterdam, 1941. German forces have invaded Amsterdam. As the tension in the city increases, the Dutch Resistance is born. Tormented by what is happening in his city, Christiaan joins the Resistance. He risks everything to shield the oppressed and fight for the freedom of his beloved nation. His brother—Floris—is ruthless and driven to succeed. Promoted to the Bureau of Jewish Affairs, he becomes instrumental in hunting Jews to transport them to the Nazi death camps.

Germany, 1945. As the ground shakes and the air raid sirens wail, Katja holds her tiny baby to her chest. She pictures Karl’s handsome face and kind blue eyes, her breath catching at the thought of him heading back to the front. She must never tell anyone about the letters she delivered for him or the other secret she is hiding....

Germany, 1941: I stroke the blonde curl away from my daughter’s face, and my heart swells. I never imagined having children, and I never thought I’d love someone this much. Clara is the most precious thing to me. I whisper to her that I will do everything I can to keep her safe.

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.