It's the third death on Cheltenham Gold Cup Day that really troubles super-sleuth Sid Halley. Former champion jockey Halley knows the perils of racing all too well - but in his day, jockeys didn't usually reach the finishing line with three .38 rounds in the chest. But this is precisely how he finds jockey Huw Walker - who, only a few hours earlier, had won the coveted Triumph Hurdle. Halley's quest for answers draws him ever deeper into the darker side of the race game, in a life-or-death power play that will push him to his very limits - both professionally and personally.