Tobie Lolness is eleven years old, he measures one and a half millimeters, and lives happily in the Tree with his parents. But today he must flee, alone.

In a small and remote boarding school lost somewhere within the Cantal heights, five teenagers are spending fall break with their jaded supervisor, Lena. But when they accidentally get cursed by an awful witch, hell unleashes and terrifying creatures of the french folklore starts pursuing them...