When, in the process of testing his newest time machine, Professor von Volt accidentally brings a triceratops, Helen of Troy, Attila the Hun, Charlemagne, and Christopher Columbus to present day New Mouse City, it is up to Geronimo and his friends to return them all to their own times and places--without being eaten by a T-Rex or skewered by Trojan warriors.

Traveling to France during the reign of Louis XIII, Geronimo and his friends enlist in the "mouseketeers" only to discover that the mouse on the throne is an impostor and together they must find the real Louis.

"My friend Hercule Poirat and I were called to investigate mysterious events at the famouse Grand Hotel in New Mouse City. There was a ghost haunting the hotel and scaring guests! It was wearing clanking armor and carrying a ball and chain. I know that ghosts don't exist, but this was pretty spooky. Would Poirat and I be able to solve the mystery of the haunted hotel?"--P. [4] of cover.

When reports of a mummy terrorizing the New Mouse City Museum flood the Rodent's Gazette's telephone lines, Geronimo Stilton, editor-in-chief, searches for an explanation to prove that there is no mummy.

Geronimo goes on a TV gameshow in order to keep his newspaper from being taken over by Cheesecake. Cheesecake! A mysterious one-eyed rat was trying to steal The Rodent's Gazette from under my snout! I had to stop him -- but how? My business manager, Shif T. Paws, came up with a plan. He arranged for me to appear on a TV quiz show. If I won, the Gazette was safe. But if I lost -- SQUEAK! -- I had to give up my tail!

"Something is wrong with Gorgo, the monster in the moat of Cacklefur Castle! Creepella discovers that he is lovesick for the monster Blobbina, who also happens to be a famous movie star. But when Creepella delivers Blobbina a love letter from Gorgo, she finds out Blobbina has disappeared! Creepella and Billy Squeakspeare head to Horrorwood to search for the missing Blobbina. Will they ever find her?"

Blossom, Queen of the Fairies, has disappeared, along with three powerful magical objects, the Book of a Thousand Spells, the Crystal Sphere, and the Whispering Wand, and Geronimo Stilton is once again called on to confront an evil wizard, rescue the Queen, recover the objects, and save the entire Kingdom of Fantasy.

Friends of the spacemice have disappeared on a strange ice planet, Polarix! Geronimo Stiltonix and his crew are called to search for them. When the spacemice arrive on Polarix, they're surprised at the inhabitants -- cute little aliens that look like colorful fuzz balls! But are these creatures as harmless as they look?

"Yes, it's true--I'm a total 'fraidy mouse and the biggest worryrat. In fact I'm the complete opposite of my super-sporty and very brave friend Bruce Hyena. That's why I couldn't believe it when he dragged me off on a series of outrageous adventures to toughen me up. I had to keep reminding him that I'm not a supermouse! Or am I?"--P. [4] of cover.

"I was so excited about Christmas I could hardly squeak! My nephew Benjamin and I were going to trim the tree and eat lots of delicious Christmas Chewy Chews. But before you could say 'cat alert, ' disaster struck. I tripped over my tail and ended up in the hospital. And then my mouse hole caught on fire! Holey cheese, this was turning out to be the worst Christmas ever"--Page 4 of cover.