It's summer and the girl’s winning synchronized swimming team is in full swing at the vast municipal swimming pool and social hub in the Paris suburb of Cergy. And it’s here that Floriane (Adele Haenel), a shapely blonde with come-hither looks, is a valued performer and star of the social set. And, although Marie (Pauline Acquart), isn't on the team, is small for her age and flat-chested, she becomes Floriane's confidante and cover for the budding siren's assignations, often at the expense of Marie's best friend, Anne (Louise Blachere). The aching doubts and offhanded cruelty of 15 and 16 year old girls is on full display in this rich coming-of-age tale.