Follow the summer of Billie's 16th birthday, a lifeguard at the water park, with her two best friends, Rosine and Juliette, as well as her perfect big sister, Annette. Billie's summer is quickly turned upside down when she falls in love with a charming cycling champion.

Catherine is a teenager going through adolescence just as her parents are getting a divorce. Her social life is no better as bullies and boys add to the pressure of growing up in the chaotic '90s.