Two young people's bond leads to marital infidelity and ultimately crime. Fanny and Jean have everything of an ideal couple: fulfilled in their professional life, they live in a magnificent apartment in the beautiful districts of Paris and seem to be in love as on the first day. But when Fanny crosses, by chance, Alain, a former high school friend, she is immediately capsized. They see each other again very quickly and get closer and closer. Two young people's bond leads to marital infidelity and ultimately crime.