The Temple of the Ruby of Fire (Geronimo Stilton #14)

Who is Geronimo Stilton? That's me! I run a newspaper, but my true
passion is writing tales of adventure. Here in New Mouse City, the
capital of Mouse Island, my books are all bestsellers! My stories are
full of fun - tastier than Swiss cheese and tangier than extra-sharp
cheddar. They are whisker-licking-good stories and that's a promise!
Holey cheese, it was exciting! Thea, Trap, Benjamin and I were on the
trail of the Ruby of Fire, a legendary gem hidden deep in the
Amazon jungle. But our quest soon turned into a race against time. Some
pretty nasty rodents were after that ruby! Could we keep the priceless
stone from falling into the wrong paws?