A ceaseless rasping noise coming from the snow-covered mountains is driving both animals and the members of the Sioux tribe crazy--but, most of all--the sweet and lanky grizzly, Lean Bear, who can't have a moment's peace. But, what has happened to Yakari's big friend who is now terrorising the animals of the Great Plains? Of course, no one can stand such a rude behaviour, especially the men of the village who want to take action. Whoever robs of everybody's sleep must stop now; however, who is to blame?
—Nick Riganas