During the boom years of the 1980s, the massed oil wealth of the princes of Dubai and Saudi Arabia were pitted against British millionaire Robert Sangster in a battle for control of one of the world’s rarest, most precious and most unpredictable commodities: top-pedigree thoroughbread racehorses.From the Jockey Club to Kentucky, from Royal Ascot to Belmont Park, high society and new money celebrated a horsebreeders’ bonanza as hundreds of millions of dollars were waged in the ultimate racing...