The annual cavemouse sports competition is here and all the mice are excited. Tiger Khan wants to be a part of the competition this time, and he will be joined by his saber-toothed henchmen. They call a truce with the cavemice and are all set to join the competition. Everything seems to be going well and everybody is busy getting ready for the big day. However, trouble starts to brew when Tiger Khan notices that his flag has gone missing. He is furious, and when Tiger Khan gets furious, it means bad news for everyone. Geronimo Stiltonoot needs to make sure that he finds the flag before things go terribly wrong.

Geronimo Stilton is the pseudonym of the famous Italian writer Elisabetta Dami. She has written the famous series of books on Geronimo Stilton. She co-owns the Italian based publishing company called Edizioni Piemme. She likes to get all her ideas through her travels to places around the world.