The Mona Mousa Code / A Cheese-Colored Camper (Geronimo Stilton #15 & #16)

I'm Geronimo Stilton. I run a newspaper, but my true passion is writing adventure stories.
In my first adventure I find a secret map hidden beneath Mouse Island's most famous painting, the Monamouse that leads to the most fabumouse discovery beneath the streets of New Mouse City! And in my second adventure my grandfather Willian Shortpaws was determined to torture me. He wanted to publish a guide book to Ratzikistan, the Siberia of Mouse Island. And he ordered *me* to go there to write it! But as you know, dear reader, I HATE TRAVELING!