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 incredible-and dangerous-than 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.