On the final day of his vacation in Palau, National Geographic research grantee and world-renowned paleoanthropologist Lee Berger accompanies a local guide to a hidden cave where he discovers a cache of fossilized human remains. Berger returns to the cave six weeks later with a team of elite scientists and finds not just one human skeleton, but several, unlike any he has ever seen. Measurements show that these people were some of the smallest humans to walk the earth, but they had enormous teeth. Has Berger discovered a lost human species or a tribe of mutants? The story of human evolution is filled with unexpected twists and turns. In 2004, a groundbreaking discovery made headlines around the world when scientists revealed evidence of a lost human species on the remote Indonesian island of Flores. Researchers believe Homo floresiensis, nicknamed The Hobbit, shared the earth with modern humans for at least 80,000 years. Is it possible that a wandering tribe of hobbit-like humans made their way 1,800 miles from Flores to Palau?