Geronimo is invited by his friend Creepella von Cacklefur to her family's spooky castle, and he is surrounded by the gloom of the castle as well as by Creepella's creepy family!.
General Note: Illustrations: Larry Keys, Blasco Tabasco, and Toffina Sakkarina.Translated from the Italian by Edizioni Piemme.Translation of: Il segreto della famiglia Tenebrax.