Esteban and Maxime are inseparable. Their families have lived in the same building in Paris since they were born. The boys consider themselves more than friends, they are brothers. And they have made a small attic room the center of their world, where they invent characters and store their most treasured possessions. But their friendship is threatened when it is revealed that Esteban and his family are moving to Spain. To prevent this from becoming a reality, the two boys dream up a plan of action.