"Moldy mozzarella! It was only a few days before Halloween when all of the pumpkins in New Mouse City disappeared. A thief was on the loose, and there was only one person I could count on to help me solve this peculiar mystery--my detective friend Hercule Poirat. But would we be able to figure out what was going on in time to save Halloween?" -- p. [4] of cover.

When his grandfather finds out he is bankrupt, Geronimo is sent off to Moldy Manor where his miserly Uncle Stingysnout teaches him to be better at saving.

"I, Geronimo Stilton, was off to the wildest part of Brazil - the Amazon jungle! I ended up on a hunt for a rare crystal treasure, which was stolen from a native tribe in the heart of the forest. I'd encounter alligators, snakes, piranhas, and other dangers on my way. Holey cheese! What an adventure!" -- Back cover.

Enter the world of Geronimo Stilton, where another funny adventure is always right around the corner.

Geronimo Stilton participates in the New Mouse City Song Festival, after his friend Champ Strongpaws enters him.

Uncle Samuel S. Stingysnout invites the whole Stilton family to creepy, faraway Penny Pincher Castle for a big surprise.

"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 Geronimo agrees to be a caddie for his grandfather in a golf tournament, he and Special Agent OOK team up to prevent the theft of the Super Mouse Cup.

While five little mice at Mouseford Academy are looking for their missing biology professor they dive to a haunted shipwreck off Whale Island to find a rare diamond that was lost when the ship sank.