Geronimo is shocked to find himself back in the Kingdom of Fantasy for a sixth time. The evil empress of the witches is after the Royal Sapphire. If she unites it with her Royal Ruby, it would give her immense power. The entire Kingdom is in danger, so Geronimo must fulfill the Ancient Gemstone Prophecy! Illustrations.

Geronimo Stilton is the publisher of The Rodent's Gazette, Mouse Island's most famouse newspaper. In his spare time, Mr. Stilton enjoys collecting antique cheese rinds, playing golf, and telling stories to his nephew Benjamin. He lives in New Mouse City, Mouse Island. Visit Geronimo online at www.scholastic.com/geronimostilton.