Geronimo Stilton

"During Napoleon's 1798 campaign in Egypt, Lieutenant Pierre-François Bouchard found the Rosetta Stone. But he doesn't know that Pirate Cats have already replaced the original piece with their own version. Now it's up to Geronimo and friends find the real Stone and give it back to history!"--

When Thea goes missing along with an ancient Mayan necklace, Geronimo Stilton is fast on the case, scouring Chichén Itzà for clues to find them.