Geronimo Stilton, the journalist talking mouse, lives in mouse city and works for the newspaper company- ‘The Rodent’s Gazette.’ Written in the autobiography form, this meek but mild-tempered mouse weaves fascinating tales of his journeys and sojourns. Originated in Italy, the series has been translated into many languages. In the sixth expedition, Geronimo finds himself back at the Kingdom of Fantasy and looks forward to carry out the Ancient Gemstone prophecy.

The evil queen of the witches seeks the Royal Sapphire for herself as it would give her immense power when combined with her Royal Ruby. The entire kingdom of Fantasy is under threat. It is Geronimo Stilton mission to find both the gemstones and stop the evil witch queen.