Geronimo Stilton, publisher and editor of the "The Rodent's Gazette," can't wait for Christmas to arrive so he can celebrate with his friends, but his mood changes dramatically when he learns that all his friends will be out of town for the holidays and he will be spending Christmas alone in New Mouse City.

Geronimo's sister Thea convinces him to help her find a haunted pirate treasure buried on a desert island, even thought he hates travel and ghosts.

Geronimo has been dreaming of a nice relaxing vacation at a seaside resort, but he winds up in a horrible fleabag hotel with barely any hope of enjoying his vacation.

Geronimo Stilton--editor of "The Rodent's Gazette"--his adventurous sister Thea, a correspondent for the paper, and their cousin Trap travel to a distant island to search for the treasure shown on an old map Thea discovers.

Geronimo explores a haunted mansion populated by ghosts.

When Geronimo Stilton's work as editor of "The Rodent's Gazette" interferes with his vacation plans, the only place he can still get a reservation sounds like a disaster, especially when he learns who he will have to share with.

Geronimo investigates the rumors of a secret hidden in Mouse City's most famous painting, the Mona Mousa, and follows a trail of clues which lead below the streets of New Mouse City.

Geronimo follows clues in a diary all the way to Mouse Everest in search of his old friend Professor von Volt who has mysteriously disappeared.

When Geronimo gets lost looking for hidden treasures in the Gobi Desert, he comes across giant dinosaur bones.