Un 1er amour à l'adolescence, ce n'est jamais simple.
Antoine, 13, spends the summer vacation with his parents in a rented cottage on an island in the middle of the Saint-Lawrence River. His neighbour, 17-year-old Anna, is an enigmatic and lively young woman. Antoine begins to experience the first stirrings of love-which soon yield a troubling brew of anxiety, desire and obsession. He eventually comes across a terrible secret that will forever change his life.