When the rodent residents of New Mouse City begin succumbing to stomachaches, hiccups, and weird green warts, Geronimo Stilton and his detective friend, Hercule Poirat, race against time to investigate before they also fall ill.

Geronimo and his friends discover a huge oyster with an enormous pearl inside. After a feature article in the Rodent's Gazette, can they protect it from being stolen?

Geronimo must find and deliver the Crown of the Seven Rubies for the king of the dragons, so that he will release Geronimo's cousin.

Grandfather Shortpaws sends Geronimo Stilton on a hunt for his old friend, the Red Bandit, in Arizona.

"Geronimo Stiltonoot and friends have been invited to participate in a Stone Age treasure hunt! How fun! The one issue is that it has been set up by Gossip Radio host Sally Rockmousen, Geronimo's rival. Is it some sort of trick? The hunt is full of difficult riddles and very stinky dinosaurs... but nothing will stop Geronimo's team!"--Back cover.

From the Jurassic period and the dinosaurs, to a medieval castle, Geronimo Stilton and a few members of his family embark on an adventure through time in Professor von Volt's new time machine, the Mouse Mover 3000.

While celebrating his birthday with his family, Geronimo realizes someone has replaced all of his money with counterfeit bills and sets out to find the thieves.

"I invited my friend Petunia Pretty Paws to visit the Bay of Whales with me. But our trip got off on the wrong paw, and my relaxing vacation turned into a real nightmare. That is, until Petunia and I came across a great white whale that needed our help" (publisher).

Geronimo travels to London on a secret mission to investigate rumors that someone is trying to steal the crown jewels, but before he can solve the mystery, he must help Trap perform a trick in a magic show.

"Join Thea Stilton and the Thea Sisters on an adventure packed with mystery and friendship! The Thea Sisters are off to save the rainforest in Malaysia"--