Eight-year-old Jack and his little sister, Annie, are playing in the woods during their summer holiday when they find a mysterious tree house full of books. But these are no ordinary books …And this is no ordinary tree house …Jack and Annie might be on their scariest adventure yet – on the Amazon river! There are army ants, jaguars, and piranas as well as vampire bats, snakes, and even crocodiles! And they’ve still got to find another clue to help rescue Morgan, the owner of the Magic Tree House. For a while, Jack and Annie are worried that they might be stuck in the rain forest forever …But the over-active monkey they meet turns out to be friendlier than they first thought!