Laurent is a failed and lazy painter. When Camille, his childhood friend, invites him to his home to get back in touch, Laurent meets Thérèse, his wife, whom he falls under the spell. The man pretexts wanting to make a portrait of his friend in order to go to the couple's house every day. Thus, Laurent and Thérèse become lovers. Their love seems to grow, but it is impossible for them to fully live their relationship. They consider excluding Camille from their lives...