When Will Mystery calls, the Thea Sisters answer the call because there is trouble in one of the fairy kingdoms: a dragon has been turning all the fairies' precious gems into stone, and wrecking havoc throughout the Crystal Kingdom -- and it is up to the sisters to find out why the dragon is destroying this Kingdom and stop him before it is too late.
Dragons -- Fiction.
Dragons -- Juvenile fiction.
Fairies -- Fiction.
Fairies -- Juvenile fiction.
Mice -- Fiction.
Mice -- Juvenile fiction.
Quests (Expeditions) -- Juvenile fiction.
Thea Sisters (Fictitious characters) -- Juvenile fiction.
Wizards -- Fiction.
Wizards -- Juvenile fiction.
Facciotto, Giuseppe, illustrator.
Pizzelli, Anna, translator.
Stilton, Thea, author.
translation of: Stilton, Geronimo. Segreto delle fate dei cristalli. English.