England, 1939: the Penrose sisters could not be more different. Skye is a daring pilot and Liberty defies her constantly. Even if women are not allowed in the Royal Air Force, Skye is determined to fight in the war. After returning from a mission, she reunites with Nicholas, her best friend from childhood, who is engaged to a French woman named Margaux Jourdan. Paris, 1947: designer Christian Dior presents his new line to a war-weary world full of pain. Margaux is the lead model. Present day: fashion historian Kat Jourdan finds a valuable collection of Dior gowns in her grandmother’s house. While investigating their mysterious origin, she begins to doubt everything she thought she knew about her beloved grandmother.