The Underwater Planet (Geronimo Stilton Spacemice #6), by Stilton, Geronimo
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- ISBN: 9780545872430 | 054587243X
- Cover: Paperback
- Copyright: 1/26/2016
While at the beach, Geronimo Stiltonix stumbles upon a mysterious treasure map! The spacemice follow it and end up on Aquarix, a planet that's entirely underwater. During their exploration, they face fur-eating seaweed, ferocious piranha aliens, and . . . pirate spacecats! Squeak! Can the spacemice keep the spacecats from stealing the treasure?