Seventeen-year-old Leo is sitting in an empty playground at night, listening to the sound of partying and pop music filtering in from the beach, when he sees another, more popular boy strangle himself with the ropes of the swings. Then, in a panic, Leo drags him to the beach and buries him. Over the next 24 hours, Leo wanders around the campsite like a sleepwalker, haunted by guilt and fear, and distracted by his desire for a girl named Luce. Meanwhile, the teenage summer rituals continue all around him --- the fighting and flirting, the smell of salt and sunscreen, the tinny announcements from the loudspeaker, and above all, the crushing, relentless heat.