Audrey and her three siblings are abandoned in an old house, where they were supposed to spend the summer vacations with their father, but he unexpectedly disappears during the night.

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.