A dangerous expedition into the Amazon Basin reveals a land of living dinosaurs in this classic science fiction novel by the creator of Sherlock Holmes.When Professor Challenger, a famous paleontologist, reports that he has discovered dinosaurs living on a remote plateau in South America, he is met with ridicule from the scientific community, particularly his rival, Professor Summerlee. With the help of a young reporter and an experienced adventurer, the two academics make a return trip to the Amazon Basin in order to verify Challenger's claims. But what they encounter there is more incredibleand dangerousthan anyone thought possible. Successfully reaching the remote plateau Challenger described, the expedition team is soon trapped in a land of pterodactyl attacks and dangerous tribes of ape men. Their findings will turn the scientific world on its head... if only they can get out alive.