Following five international riders from the USA, Canada, South Africa and the United Kingdom, this nail-biting documentary explores the longest and toughest horse race on the planet, the Mongol Derby horse race in Mongolia. A recreation of Genghis Khan’s postal system, this epic multi-stage, multi-horse race takes place over 1000 kilometres of Mongolian steppe where the riders are out on their own, spending the nights out in the wild or with nomad families along the way.