Geronimo Stilton is a mouse and the editor of the newspaper The Rodent's Gazette. Beginning his adventures, Geronimo's sister Thea invites him on a treasure hunt. Well, who can resist that? Certainly not Geronimo, who joins Thea and their cousin Trap on a sea voyage to the island on the treasure map. 

While on their ship, THE LUCKY LADY, Geronimo discovers a stowaway, encounters a hurricane, stars in a "mouse overboard" scenario, is shipwrecked --- and that's just the beginning! Will the band of adventurers get rich? Will they even survive?