Australia's world champion racehorse Winx has become a sporting giant, transcending racing in the same way that Muhammad Ali transcends boxing and Don Bradman transcends cricket. She is described by her trainer, Chris Waller, as a supreme athlete - a world-class sprinter with a freakish ability to dominate longer distances 'like Usain Bolt running in 1500-metre races'. She is the Phar Lap of the modern age, and one of the greatest racehorses in 300 years of thoroughbred racing.

In Winx: The Authorised Biography, Andrew Rule, her owners, her breeder, her trainer and her rider tell the real stories behind the world's greatest racehorse.