When Geronimo's sister, Thea, discovers an old, mysterious map showing a secret treasure hidden on a faraway island, the gang of the "Rodent's gazette" is dragged into a treasure hunt.

"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 the quest to find a cure to an epidemic targeting the citizens of New Mouse City is sabotaged, Geronimo Stilton must figure out who's behind it all before he ends up covered in blue spots too.

"Oh, no! One of the special miceking helmets in miceking chief Sven the Shouter's private collection has been stolen! Could it have been taken by the vilekings -- the rival mouse clan? The micekings journey to the vilekings' village to find out . . . and while they're there, the dragons attack! Can all the mice work together to save their fur?"--Page 4 of cover

When Geronimo is invited to Creepella von Cacklefur's spooky castle, he is surrounded by the gloom of the castle as well as by Creepella's creepy family!

Geronimo explores a haunted mansion populated by ghosts.

Geronimo Stilton gets caught up in the World Karate Championships, thanks to the efforts of Bruce Hyena and Piccolo Tao, Bruce's super-sporty cousin. Geronimo only has a week to become real champion material! Will Geronimo manage to overcome his fears in order to win the competition?

I have never been a brave mouse, but lately, my fears were taking over my life! So Thea and Trap decided to cure me by dragging me all the way to the jungle, where I was forced to eat bug soup, swim in raging rivers, and even wrangle snakes! How would a 'fraidy mouse like me ever survive?

When director Mousen Scorsese's newest film goes missing at New Mouse City's first film festival, Hercule and Geronimo spring into action to solve the case.

"Sally Ratmousen, Editor-in-Chief of The Daily Rat and Geronimo Stilton's biggest journalistic rival, mysteriously disappears one afternoon on the way to her car after work. Her ace reporter, Simon Squealer, shows up at Geronimo's door with the troubling news... and reveals that notorious mobster Barry the Moustache is behind her disappearance. Is he telling Geronimo the truth or is this fake news? If it's a hoax just to generate headlines, Geronimo...