Geronimo Stilton's ancient ancestor, Geronimo Stiltonoot, is back in another prehistoric adventure!

It’s time for the Stone Age Games – the annual cavemouse sports competition! This year, the saber-toothed tigers want to take part, so they call a truce with the mice. Everything seems set for some friendly fun… until the tigers’ flag mysteriously disappears.

Now Tiger Khan is blaming the cavemice, and tensions are rising fast! Can Geronimo Stiltonoot solve the mystery, find the missing flag, and keep his fur intact before the truce crumbles?