Paris, 1944: The war is nearly over, but for members of the Resistance in occupied France, it is more dangerous than ever before. Twenty-five-year-old Gabby Foucher loathes the Nazis, though as the concierge of 10 rue Royale, she does her best to avoid conflict - unlike her bolder sister Yvette, who finds trouble at every turn.

In enemy-occupied Paris, as the locals go to bed starving and defeated by the war, music and laughter spills through the door of a little restaurant, crowded with German soldiers. The owner, Marianne, moves on weary feet between its packed tables, carrying plates of steaming, wholesome food for the enemy officers. Her smile is bright and sparkling, her welcome cordial. Nobody would guess the hatred she hides in her heart. That night, the restaurant closes its doors for the final time.

England, 1918. Armistice Day should bring peace into Leonora's life. Rather than secretly making cosmetics in her father's chemist shop to sell to army nurses such as Joan, her adventurous Australian friend, Leo hopes to now display her wares openly. Instead, Spanish flu arrives in the village, claiming her father's life. Determined to start over, she boards a ship to New York City. On the way she meets debonair department store heir Everett Forsyth....

World War II London: When Victoire “Paddy” Bennett first walks into the Admiralty’s Room 39, home to the Intelligence Division, all the bright and lively young woman expects is a secretarial position to the charismatic Commander Ian Fleming. But soon her job is so much more, and when Fleming proposes a daring plot to deceive the Germans about Allied invasion plans he requests the newlywed Paddy's help. She jumps at the chance to work as an agent in the field, even after the operation begins to affect her marriage. But could doing her duty for King and country come at too great a cost?

June 1946. As the residents of Winthrop Island prepare for the first summer season after the sacrifice of war, a glamorous new figure moves into the guest cottage at Summerly, the idyllic seaside estate of the wealthy Peabody family. To Emilia Winthrop, daughter of Summerly’s year-round caretaker and a descendant of the island’s settlers, Olive Rainsford opens a window into a world of shining possibility. While Emilia spent the war years caring for her incapacitated mother, Olive traveled the world, married fascinating men, and involved herself in political causes.