A Mammoth Mystery (Geronimo Stilton Cavemice #15)

All the mammoths have fled Old Mouse City! It's a total cat-astrophe! Not only because mammoths are valuable allies of the cavemice, but also because without them, the cavemice can't make mammoth milkshakes, their delicious national drink. Geronimo Stiltonoot must embark on a daring journey to find the mammoths…and avoid going extinct before he gets back!

• Shoo, Caveflies! (Geronimo Stilton Cavemice #14)
• Slurp Monster Showdown (Geronimo Stilton Spacemice #9)
• Operation: Secret Recipe (Geronimo Stilton #66)
• The Helmet Holdup (Geronimo Stilton Micekings #6)
• The Underwater Planet (Geronimo Stilton Spacemice #6)
• Pirate Spacecat Attack (Geronimo Stilton Spacemice #10)
• Attack of the Bandit Cats (Geronimo Stilton, No. 8)
• The Cheese Experiment (Geronimo Stilton #63)
• The Chocolate Chase (Geronimo Stilton #67)
• Away in a Star Sled (Geronimo Stilton Spacemice #8)