Southern France, 1980s. The familial and professional happiness of Marc Palestro, a successful real estate agent, is derailed when he meets a client who is negotiating the purchase of a large castle in the region on behalf of a large company. Marc believes this pretty blonde to be Cathy, his childhood sweetheart back in Algeria, and he embarks on a passionate affair with her. However, Marc's mother insists Cathy and her family died in an explosion in 1962 shortly after the Palestros left for France. To add to the confusion, Marc's boss and father-in-law, who controls the sale of the castle, suspects the blonde client of real estate fraud.