At the 1928 Amsterdam Olympics an unknown Vancouver runner named Percy Williams shocked the sports world by capturing the 100- and 200-metre gold medals. Some said the feat was a fluke. It wasn't. In 1929 Percy silenced naysayers by sweeping the US indoor track circuit, then he went on to set a world record in the 100 metres that would stand until the arrival of Jesse Owens. And in between he waged a speed duel with the fleetest men on the planet,...