In the forest up the street of their small suburban town, Roxanne (10 years old), her older brother Guillaume (12 years old) and their friend Marc-Andre (10 years old) are building a treehouse in this forest. This forest went through many generations of children and their treehouses. Many stories are linked to it however, the legend of the burnt treehouse remained the most talked about. Roxanne believes in the existence of this treehouse and she is determined, that day, to resolve the mystery around it.