Crustacés et coquillages is a fresh French comedy film with numerous surprise turnarounds and about the tolerance of a family of four. The family spend an idealistic summer vacation together where each of the family members gets involved in a new or old relationship.

During the Christmas holiday season, Félix and Céline find themselves working as volunteers for the drive-home service Opération Nez Rouge. Right from the first, Félix falls for Céline. But Céline doesn't feel the same way: she can't forget the fact that Félix once wrote a scathing review of her first piece of writing, crushing her literary ambitions in the process. Worse, Félix doesn't even remember her name. Céline decides to take her revenge. Just as things seem to be going from bad to worse for Félix, Céline realizes that he is vulnerable, tender... and madly in love with her. She is ready to surrender to love... but a chance encounter causes her to wonder whether Félix isn't playing some twisted love game.