Law lecturer Maria (Chiara Mastroianni) and Richard (Benjamin Biolay) have been married for twenty years. They remain a loving couple and the best of friends but Maria has had a string of affairs with a collection of handsome younger men. She returns home one winter’s evening, showering away the traces of her latest indiscretion as a frumpy, unsuspecting Richard prepares dinner and fills the washing machine. A text message on Maria’s phone alerts him to her infidelity. What she dismisses as a bit of fun, he regards as a complete betrayal. Can the marriage survive without trust? Maria leaves in the middle of the night and checks into a hotel room directly opposite their Montparnasse apartment. She hopes it will let her see Richard and their life from a different perspective..