The story unfolds during summer in a campground beside a lake. 17-year-old Camille is stuck there, trapped between her parents and her boyfriend. She meets Blaise, in his forties, who has just scored a sailing instructor job. Camille and Blaise both feel dissatisfied with life – it draws them together and separates them from the others. But their complicity fuels rumors of an affair that infuriates their entourage and unleashes heated passions. The couple then throws itself headlong into a dangerous love affair.