The Thea Sisters travel through Mount Everest to enlist the help of the magical creatures they encounter on their journey to the Cloud Castle, where they are investigating why the clouds are disappearing from the Land of Clouds.
General Note: At head of title: Geronimo Stilton.Geronimo Stilton and Thea Stilton are fictitious characters.Translation of: Il segreto delle fate delle nuvole."Based on an original idea by Elisabetta Dami"--Title page verso.LSC 18.99