About this book
The world s most famouse painting is hiding a big secret! An X-ray of the Mona Mousa reveals a strange riddle. Solving the clues takes Geronimo to the most dangerous parts of the city, but facing the hair-raising rollercoasters and vicious octopuses is all worth it for the amazing treasure at the end of the trail. Isn't it?

About the series
Meet Geronimo Stilton (The Indiana Jones of the Mouse world!) the famouse journalist, who although is of the quiet (and frightened way too easily) mousey kind, always finds himself in THE MOST ridiculously terrifying adventures one could only imagine, and all just to find the next hot story for his newspaper, The Rodent's Gazette!

Filled with humour and engaging illustrations make this series perfect for 5 to 8 year olds.