Geronimo unlocks the mystery in this fabumouse adventure -- which includes a bonus story! My sister, Thea, had discovered an enormouse old castle built by the founder of New Mouse City! She and Trap dragged me along with them to explore it. Inside, we found one hundred keys... but only ninety-nine doors to unlock. What mysterious room did the hundredth key open? It was up to us to find it and reveal its secrets! BONUS! After the story, read an extra Mini Mystery adventure and jokes galore!

Geronimo is on the hunt in this fabumouse adventure -- which includes a bonus story! There was a mystery in New Mouse City's Egyptian Mouseum! The Black Papyrus, an ancient document that reveals the secret of eternal youth, had disappeared. The mouseum's director asked me to help him find it. Yikes -- those Egyptian artifacts freak me out! Luckily, a secret agent came to our aid... but could we trust him? It was up to us to recover the precious scroll!BONUS! After the story, read an extra Mini Mystery adventure and jokes galore!

It's a curious case for Geronimo in this special edition adventure! Rancid ricotta! Something strange was happening in New Mouse City. Rodents were suddenly getting sick with stomachaches, hiccups, and weird green warts -- and it seemed to be related to cheese! We mice eat a lot of cheese, so this was serious. My detective friend, Hercule Poirat, asked me to help him investigate. Could we solve this mystery and save our city?BONUS! After the story, read an extra Mini Mystery adventure and jokes galore!

Writing a new book to present at a 10th anniversary publication party being thrown in his honor, Geronimo Stilton is on the case when his laptop is stolen, in a special edition adventure complemented by a bonus Mini Mystery.

The Colosseum is being haunted by a gladiator ghost. None of the tourists want to visit anymore! Geronimo must solve the mystery and rid the site of its ghost.*Plus BONUS Mini Mystery: The Cheese BurglarCan Geronimo clear his name and catch the real thief before it's too late?

A curious case for Geronimo! Rancid ricotta! Something strange was happening in New Mouse City. Rodents were suddenly getting sick with stomachaches, hiccups and weird green warts and it seemed to be related to cheese! We mice eat a lot of cheese, so this was serious. My detective friend Hercule Poirat asked me to help him investigate. Could we solve this mystery and save our city?