Beijing 2008, the 100 metres final: Usain Bolt slows down, beats his chest, metres clear of his nearest rival, his face filled with the euphoria of a young man utterly in thrall to his extraordinary physical talent. It is one of the greatest sporting moments. It is just the beginning. Of the ten fastest 100-metres times in history, eight belong to Jamaicans. How is it that a small Caribbean island has come to almost totally dominate the men's and women's sprint events? The Bolt Supremacy opens the doors to a community where sprinting permeates conversations and interactions; where the high school championships are watched by 35,000 screaming fans; where identity, success and status are forged on the track, and where making it is a pass to a world of adoration and lucrative contracts.