New York-based photographer Cat Jordan is ready to begin a new life with her successful, button-down boyfriend. But when she learns that she's inherited the estate of a complete stranger―a woman named Isabelle de Florian―her life is turned upside down. Cat arrives in Paris to find that she is now the owner of a perfectly preserved Belle Époque apartment in the ninth arrondissement, and that the Frenchwoman's family knew nothing about this secret...