Geronimo Stilton : Cavemice - A Mammoth Mystery (#15)

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