"Geronimo is in serious need of an intervention. With a list of fears growing taller than Ratburger's extra-large triple cheese milkshake, Geronimo's family decide action must be taken. What better way to face your fears than through a week-long jungle boot camp? Geronimo takes on treacherous hikes, roaring rivers and fierce snakes, but will he come back a changed mouse?"--Publisher's description.

Holey cheese, it was strange! All across New Mouse City, rodents kept telling me I'd done things I had no memory of. Was I going crazy? Had the cheese finally slipped off my cracker? No, that wasn't it. I soon discovered the truth: There was a Geronimo lookalike going around, pretending to be me! He'd even fooled my sister Thea. Worst of all, he was trying to take over The Rodent's Gazette! I had to get that greedy impostor's paws off my newspaper,...

A mysterious old friend of Grandpa Frankenstein (he's a vampire) shows up one night on the doorstep of Cacklefur Castle. His ancient castle has been infested by strange and troublesome monsters and ghosts, and he's afraid he'll have to move out because of them. It's up to Creepella and her family and friends to help this vampire save his home.

Creepella's father, Boris von Cacklefur, is a finalist in the Fright Night contest--Gloomeria's prestigious poetry competition. If he can perform the most terrifying rhymes, he will be crowned Fright Night Idol! But midway through the contest, Boris mysteriously disappears. Can Creepella and her friends find him before the final round?

Creepella von Cacklefur and her niece, Shivereen, visit scary Squeakspeare Mansion. There they meet Bobby Squeakspeare, a descendent of the famouse writer, William Squeakspeare. Will the spooky rooms and ghosts they find inside the mansion be friendly--or frightening?

Geronimo Stilton finds himself in the wild West, where he becomes involved in a showdown with the "wickedest" rat of Cactus City.

Geronimo travels to Ratzikistan to help his grandfather write a guide book about this remote area.

Creepella is about to interview the famouse Hector Spector, who has come to Mysterious Valley with his Galloping Ghost Circus. But before she can, she has a mystery on her paws--someone is playing tricks and making messes all over Cacklefur Castle! Can she put a stop to these ghastly gags?

After receiving a mysterious message summoning him to a meeting, Geronimo Stilton finds himself back in the Kingdom of Fantasy, summoned by the Elves, who want him to travel to the Great Explanatorium to find an answer to the earthquakes that are threatening the Kingdom.

Geronimo joins the effort to rescue Blossom, Queen of the Fairies, who has been kidnapped by the Queen of the Witches and taken to the Kingdom of Nightmares.