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?

"It's supposed to be a relaxing vacation, but instead Geronimo works his tail off fixing up an old castle. Worst. Vacation. Ever"--cFrom publisher's website.

"New Mouse City was in a panic. A strange epidemic had broken out --mice everywhere were covered in weird blue spots. Mouse Island's most famouse doctor immediately set to work with his team to try to find the cure--but someone was trying to stop him. Could I figure out who before I ended up blue myself?"--Page 4 of cover.

The discovery of an old map by his sister Thea leads Geronimo and his family to search for buried treasure on a faraway island.

"Everymouse on Mouse Island was squeaking about The Super Cup! My two favorite soccer teams, the Squeakers and the Turbo Cheese, had made it to the finals. But something suspicious was happening on the field. The Mighty Mice and the Sewer Rats seemed to be scoring without even trying! Could I get to the bottom of it before my two favorite teams are cheated out of their trophies?"--Back cover.

Geronimo Stilton gets a new aide, Pinky Pick and has an adventure in the North Pole.

Geronimo explores a haunted mansion populated by ghosts.

Geronimo Stilton, which was originally written in Italian, is a tale about a talking mouse that lives in New Mouse City on Mouse Island, where he works as a journalist for The Rodent's Gazette. Included here are adventure books fifteen and sixteen: A Cheese-Colored Camper and The Mona Mousa Code.

Geronimo Stilton is entered in the Mouse Island Marathon by his friend Champ Strongpaws who then forces him to train for it.

"Geronimo takes a vacation to the Camel Oasis!"--