Paris, 1975. Camille sifts through letters of condolence after her mother's death when a strange, handwritten missive stops her short. At first she believes she received it by mistake. But then, a new letter arrives each week from a mysterious stranger, Louis, who seems intent on recounting the story of his first love, Annie. They were separated in the years before World War II when Annie befriended a wealthy, barren couple and...