Pierre (François Cluzet) and Anne (Lisa Azuelos) have been married for many years and have raised two children together. They have always been very close and good. Pierre considers himself a competent husband and a responsible father. He is very satisfied and very lucky to have a peaceful life now. One day, Pierre met a woman named Elsa (Sophie Marceau). Elsa's unique charm gradually attracted Pierre, and Pierre felt that something in his heart was revived. However, Pierre did not want to leave his wife, but he could not ignore the throbbing in his heart. What surprised him was that Elsa had the same feeling for him. The two honest adults got closer and closer, and finally crossed the boundaries of ethics and morality.