James Cracknell investigates the mysterious disappearance of one of the World’s most famous Amazonian jungle explorers, Colonel Percy Fawcett. In 1925, Fawcett vanished in the remote Xingu region of the largest tropical rainforest on Earth. Now, James Cracknell goes in search of answers, as he discovers just how tough an environment the jungle really is. Hacking through dense jungle, befriending remote tribes, and wading across deadly swamps, Cracknell takes on the environment he fears more than any other, in a quest that becomes more dangerous than he ever imagined.