The Mongol Derby is the world’s toughest horse race. A feat of endurance across the vast Mongolian plains once traversed by the people of Genghis Khan, competitors ride 25 horses across a distance of 1000km. Many riders don’t make it to the finish line. In 2013 Lara Prior-Palmer – 19, underprepared but seeking the great unknown – decided to enter the race. Driven by her own restlessness, stubbornness, and a lifelong love of horses, she raced for seven days through extreme heat and terrifying storms, catching a few hours of sleep where she could at the homes of nomadic families. Battling bouts of illness and dehydration, exhaustion and bruising falls, she found she had nothing to lose, and tore through the field with her motley crew of horses. In one of the Derby’s most unexpected results, she became the youngest-ever champion and the first woman to win the race.