When Indian workers begin to disappear from an expedition into the Amazon, fifteen-year-old Jake fears that his father, a bat biologist, is in great danger. Against his dad's wishes, Jake flies to Brazil and joins his father's research team, working high in the canopy of a remote stretch of the rain forest. Jake's first climb up the rope bridges and suspended walkways of the forest leads him to discover the mutilated bodies of the missing Indians-and triggers a terrifying attack by a winged beast. Jake realizes that it is up to him to find some way of stopping the nightmarish creature before it returns to slaughter the rest of the expedition.