A group of friends in their twenties spend the summer in Martigues, in the south of France. They meet Solène, a young Parisian also on holiday in the area. One evening, as they are exploring the hills, they make a sinister discovery.A group of friends in their twenties spend the summer in Martigues, in the south of France. They meet Solène, a young Parisian also on holiday in the area. One evening, as they are exploring the hills, they make a sinister discovery.