The Search for Treasure (Geronimo Stilton and the Kingdom of Fantasy #6)

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.