The Enormouse Pearl Heist

One day, my friends and I, Geronimo Stilton, made an amazing discovery. We found a huge oyster -- with an enormouse pearl inside! I was so excited about this extremely rare, precious pearl that I wrote a special feature about it in The Rodent's Gazette. That article attracted lots of attention -- both good and bad! The enormouse pearl was in danger of being stolen. Would my friends and I be able to protect it?