At 16, almost 6 feet tall, Billie is behind in almost everything. In a hurry to catch up, she begins her summer as a lifeguard at the water park with her two best friends Rosine and Juliette, and her perfect big sister Annette. This summer is quickly turned upside down when Billie falls in love with Pierre, a young prodigy cyclist, and Annette also falls under his spell. Then follows a heartbreaking love triangle where Billie must once and for all take her place and fight to live the love story she deserves, while protecting this link as fragile as it is indestructible with her sister.