La Plus Belle pour aller danser

Marie-Luce Bison, 14, is being raised by her father in a cheerful boarding house for senior citizens, where he is the director. Her new school's costume party is coming up soon; her father doesn't want her to go... and she's not invited anyway. But urged on by Albert, her 80-year-old best friend, Marie-Luce crashes the party, dressed as a boy. That evening, everyone thinks she's a boy... a boy who people look at and like. So she decides to invent a male double named Léo to finally live her teenage life. Of course, at home, her relationship with her father is getting more complicated.