An incredible claim by the eccentric Professor Challenger leads to an expedition deep into the Amazon, where an unlikely group of men find themselves on a journey into unknown dangers. Will they have the skills, strength, intelligence and good fortune to survive? Do dinosaurs really exist on the inaccessible plateau? How did a human skeleton become impaled on a bamboo spike? Can humans survive in a land of such primitive powers? If journalist Edward Malone ever returns home to write his newspaper report, will it be to declare Challenger a madman or a genius?