Long Island teenagers Hal and Roger Hunt embark on a pioneering expedition down the Amazon River with their father, expert naturalist John Hunt. They travel deep into unchartered jungle territory and collect exotic animals. But someone is out to get them and the boys’ father is forced to return home. Hal and Roger are left on their own to face hostile natives, dangerous rapids and wild animals, and their progress is continually delayed by a brutal enemy hot on the boys’ trail.
