England, 1939: The Penrose sisters couldn't be more different. Skye is a daring and brash pilot, and Liberty is the one to defy her at every turn. Even if women aren't allowed in the Royal Air Force, Skye is determined to help the war effort. She's thrilled when it reunites her with her childhood soul mate, Nicholas. She's less thrilled to learn Nicholas is now engaged to an enigmatic Frenchwoman named Margaux Jourdan.

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.

Georgeanna “Georgey” Woolsey isn’t meant for the world of lavish parties and the demure attitudes of women of her stature. So when war ignites the nation, Georgey follows her passion for nursing during a time when doctors considered women on the battlefront a bother. In proving them wrong, she and her sister Eliza venture from New York to Washington, DC, to Gettysburg and witness the unparalleled horrors of slavery as they become involved in the war effort.

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.

London, 1938: The bookstore just doesn’t feel the same to Gertie Bingham ever since the death of her beloved husband Harry. Bingham Books was a dream they shared together, and without Harry, Gertie wonders if it’s time to take her faithful old lab, Hemingway, and retire to the seaside. But fate has other plans for Gertie. In Germany, Hitler is on the rise, and Jewish families are making the heart-wrenching decision to send their children away from the growing turmoil. After a nudge from her dear friend Charles, Gertie decides to take in one of these refugees.