Lost Treasure of the Emerald Eye. Geronimo Stilton #1 - Geronimo Stilton

Lost Treasure of the Emerald Eye is the 1st book in the Geronimo Stilton Series. Geronimo Stilton: respected journalist, family mouse... well-seasoned traveller? No thank you! But when Geronimo's sister Thea finds a mysterious map of a secret treasure on a faraway island, Geronimo just can't say no. Before long, Geronimo and his family are on the high seas, getting into enormouse trouble!