Hal and Roger Hunt sink deep into danger when a specimen-collecting trip takes them into the lost world of the South Seas. But their deep-sea adventure has a hidden agenda - a top-secret mission for a colleague of their father whose scientific experiments in Pearl Lagoon could cost them their lives.
Hal and Roger Hunt embark on a pioneering expedition to the greatest jungle on earth: the Amazon. But someone is out to stop them, and when their mission to explore the uncharted territory of the Pastaza River goes off course . . . it's survival of the fittest.
