58 pages. The incredibly popular Geronimo Stilton appears in graphic novel form for the first time in the U.S.! Geronimo lives in New Mouse City on Mouse Island where he works at The Rodent's Gazette, the city's most famous newspaper. In this series of graphic novels, Geronimo travels through time to defend history from his arch nemeses, the Pirate Cats. In The Discovery of America, Geronimo joins Christopher Columbus on his voyage from Italy to the New World in 1492 in order to stop the Pirate Cats and save all of the mice on Mouse Island. In The Secret of the Sphinx, the devious felines are determined to change the face on the Sphinx to be a cat and not a man!