Geronimo Stilton Creepella Von Cacklefur Return Of The Vampire (P)

On a gloomy night with the full moon, a strange figure appears on the threshold of the Castle of the Skull: it is Camilo Sangredulce, an old adventure companion of Grandfather Ratonquenstein. Furthermore, Camilo is… a vampire, and his profession is to taste tomato juice. What is Camilo doing at the Tenebrax house at midnight?