The Flying Beaver Brothers are back! All is not well on Beaver Island. Ace and Bub have noticed a number of things (trees, houses, evil penguins) sinking into the ground. They soon discover that Captain Jo Jo and his scurvy crew of mud-making moles have hatched a nearsighted plot to steal dirt from Beaver Island to make their own island home even bigger! <br><br>Can Ace and Bub stop their brotherly bickering and save Beaver Island before it disappears forever?