Ellie Carver arrives at her grandmother's bedside expecting to find her silently slipping away. Instead, the beloved woman begins speaking. Of a secret past and castle ruins forgotten by time. Of a hidden chapel that served as a rendezvous for the French Resistance in World War II. Of lost love and deep regret . . .

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.

Present day: Manhattan art dealer Sera James watched her world crumble at the altar two years ago, and her heart is still fragile. Her desire for distraction reignites a passion for a mysterious portrait she first saw as a young girl—a painting of a young violinist with piercing blue eyes. In her search for the painting, Sera crosses paths with William Hanover—the grandson of a wealthy California real estate mogul—who may be the key to uncovering the hidden masterpiece.

Paris, 1939. Maison Chanel has closed, thrusting haute couture dressmaker Lila de Laurent out of the world of high fashion as Nazi soldiers invade the streets and the City of Lights slips into darkness. Lila’s life is now a series of rations, brutal restrictions, and carefully controlled propaganda while Paris is cut off from the rest of the world. Yet in hidden corners of the city, the faithful pledge to resist. Lila is drawn to La Resistance and is soon using her skills as a dressmaker to infiltrate the Nazi elite.