"Princess Shiori made a deathbed promise to return the dragon's pearl to its rightful owner, but keeping that promise is more dangerous than she ever imagined. She must journey to the kingdom of dragons, navigate political intrigue among humans and dragons alike, fend off thieves who covet the pearl for themselves and will go to any lengths to get it, all while cultivating the appearance of a perfect princess to dissuade those who would see her burned...

"Hector lives with his family at the Marina in an Italian coastal town where they organize tourist expeditions to explore the many wonders of the sea. Hector's dream is to become a deep-sea diver, just like his father. Then, one day, an unscrupulous entrepreneur opens a much newer center next door, forcing them to close their business. This man has a single purpose, to find the legendary Pearl in order to sell it and make money. Hector decides to...

When he and his friends discover a huge clam containing a giant and extremely rare pearl, Geronimo Stilton writes an article about the finding in the Rodent's Gazette and attracts the attention of would-be pearl thieves.