July 1996, the beach, the sea, the sun. Sophie, 10, spends her summer vacations with her mother and her cousin Laurence. But Laurence has grown up and her mother's thoughts are elsewhere. While the whole country is still looking for two missing little girls, Sophie discovers that this will be her last summer as a child.
14-years-old boy Mayeul is very popular, and he is a bully. When Louise comes back to school with an eye injury, Mayeul tries to hide his involvement, but has to deal with his guilt.