Shortly after the First World War, Julien Davenne returns home to lead a quiet life. However, his existence harbours a secret: his passionate memories of Julie, the woman he lost shortly after their marriage. One of the rooms in the house, the ‘green room’, is dedicated to his devotion to her. His search for mementos linked to Julie leads him to an auction house, where Cécilia, the auctioneer’s assistant, helps him find a ring that had belonged to her…