"Rancid rat hairs! I'd been spending so much money lately, I had none left in the bank! Even worse, when my grandfather found out, he sent me off to Moldy Manor. There, miserly Uncle Stingysnout would teach me to be better at saving. How terrible! Could I learn to be less wasteful without going crazy?" --

Once again Geronimo Stilton is pulled into the Kingdom of Fantasy, where he is needed to fulfill the ancient Gemstone Prophecy, and prevent Scorcher, the evil Empress of Witches, from obtaining the Royal Sapphire which will give her immense power.