A captivating novel based on the story of the extraordinary real-life American woman who secretly worked for the French Resistance during World War II--while playing hostess to the invading Germans at the iconic Hotel Ritz in Paris--from the New York Times bestselling author of The Aviator's Wife and The Swans of Fifth Avenue. In March 1940, the Nazis sweep Paris and immediately take up residence in one of the city's most iconic sites: The Hotel Ritz....