Noonday Gun by Ted McLoughlin

Financial advisor David Burke finds himself in for the ride of his life when he accepts a job with horse-racing mogul and wealthy international business tycoon, Tony Cheng.
Soon David finds himself jet-setting around the world, from the racecourse circuit in Wexford, Ireland, to the UK and Australia, involved with an unforgettable cast of characters determined to make horse racing history.
But can their most promising horse, Noonday Gun, outlast the competition and bring David and his boss's racing empire the world-class status they crave?