Geronimo Stilton meets the Stone Age in this spin-off series! Geronimo Stilton’s ancient ancestor Geronimo Stiltonoot stars in the Cavemice series! Geronimo Stiltonoot wakes up to a terrible morning. Meteors are falling from the sky, and it seems like everyone in Old Mouse City has an awful stomachache! Geronimo must travel to the Cave of Memories to find the ancient shaman cure for his fellow cavemice. But dangers lurk on his journey — can he make it back home safely?