Eleven-year-old ace detective Laura Marlin finds herself deep in the murky world of race-fixing, trickery and horse thieves in her third mystery adventure, from award-winning author Lauren St John.Laura Marlin's two greatest loves in life are detective novels and animals, so she is ecstatic when her uncle agrees to let her keep a horse after they rescue it, crazed with fear, from an overturned horsebox.But he has a condition. Before he will allow her to adopt it they have to find its former owner, just to ensure that it hasn't been stolen.A visit to Newmarket to investigate the thoroughbred's origins leads Laura to the Kentucky Derby in the US and deep into the murky world of race-fixing.