Enter the world of Geronimo Stilton, where another funny adventure is always right around the corner. Each book is a fast-paced adventure with lively art and a unique format kids 7-10 will love.

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!

Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.

Mavis is thrilled to be reunited with her friends Sophie and Charlotte, twin werewolves from her Ghoul Scout troop. But when Aunt Lydia smells humans on the premises, she orders a lockdown of the castle and a search of the entire hotel. Mavis loves the idea of having her friends stay even longer than planned, but the twins are not. They're hiding a big secret that may put them straight in the path of Aunt Lydia's search party!

"Olga is an orphan and a thief, relying on trickery and sleight of hand to make her way in the world. But it's magic, not thievery, that could get her into trouble. When Olga and her partner-in-crime Pavel learn of a valuable jewel kept in a secluded castle, Olga sees an opportunity to change their lives: a prize so big, they'd never have to steal again. But the castle is not as it seems, ruled by an enchanter who hosts grand balls every night, only...