Now the four mice are heading up the Amazon River in the professor's fancy submarine. The crocodiles, poisonous snakes, and other wildlife make Geronimo a little nervous, but he's enjoying the trip. Soon, however, their quest turns into a race against time. Some nasty rodents are after the ruby too—and it's up to Geronimo and the gang to figure out a way to keep the priceless stone from falling into the wrong paws!
This funny full-color escapade will delight fans of the bestselling series and Geronimo Stilton newcomers alike!
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