The Sahara is the biggest desert on earth. It takes its name from the Arab word for "emptiness". In the dead heart of that emptiness there's a place called the Tenere. The Tenere takes its name from the Tuareg word for "nothing". A nothing the size of France in the middle of an emptiness the size of the United States. It's no wonder the locals call this place "The Land Of Fear”. David Adams retraces the trade routes of the people who call this stove-hot corner of the planet home.