Moldy Mozzarella! Geronimo Stilton has his own graphic novel!  Stories have gone high-tech and include a time machine.  It’s cats vs rats as the Pirate cats and Geronimo’s family go back in time to sail with Columbus.  The Pirate cats want to change history by preventing Columbus from discovering America.  Geronimo and relatives use Professor Volt’s new time machine, Speedrat, to travel back to join Christopher Columbus’s crew in order to foil the cats’ intentions.  Font color and style are still included with the comic book format.  Fact boxes add information about Columbus and his expedition in 1492. End pages introduce this cast of characters and give a taste of the story inside.  There is plenty of action and shenanigans to make this a true page-turner.  A fun combination of historical facts and fantasy to appeal to Geronimo Stilton fans.