It's summer and, for the first time, Marc and his wife Beatrix are spending the holidays with their children in the same house on the Mediterranean where Marc used to spend his own summer break as a teenager. Although the mistral is up and the sea is still rather cool, the summer's heat slowly begins to kindle the senses as well as all kinds of desires. The couple's daughter Laura can't wait for her boyfriend to arrive and whisk her away on his motorbike from the confines of the family. Laura's brother, Charly, is waiting for Martin, who is in love with Charly. But Charly isn't gay. Sensing the tension between the two boys, Beatrix starts to believe her son could be gay. Not thinking anything of her suspicion, she mentions it to Marc, for whom it is something of a blow. Things are further complicated by the arrival of Beatrix' lover, Matthieu, who wants her to leave her husband for good. And so the summer holidays actually turn out to be rather exciting: the love life of all the various members of the family causes plenty of back and forth during the night, not to mention the slamming of doors.