Under orders

'Sadly, death at the races is not uncommon. However, three in a single afternoon was sufficiently unusual to raise more than an eyebrow.'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.Just moments before the gruesome discovery, Halley had been called upon by…