Jack and Annie travel back in time to a South American rain forest in search of the elusive magician Morgan le Fay. Will they find a new clue to her whereabouts before they are trampled by stampeding killer ants? Eight-year-old Jack, his seven-year-old sister, Annie, and Peanut the mouse ride in a tree house to the Amazon rain forests, where they encounter giant ants, flesh-eating piranhas, hungry crocodiles, and wild jaguars.