The Mona Mousa Code is a parody adventure inspired by the famous Da Vinci Code. Geronimo Stilton finds himself entangled in a massive, international mystery involving a priceless piece of art—a painting of the Mona Mousa—and a series of cryptic clues hidden within. The mystery takes Geronimo and his family across Europe, forcing them to decipher codes, unravel historical secrets, and evade suspicious characters who are also after the key to the code. The book cleverly blends real-world art history and secret society tropes with the series’ trademark humor and stylized typography, making the complex mystery accessible and fun for young readers.