The Twister by Edgar Wallace

There was once a little trainer of racehorses and a jockey who were at variance. The third party to the dispute was a bookmaker of dubious reputation and the trouble arose over a horse called Ectis, which was favourite for the Royal Hunt Cup. Both jockey and trainer were under suspicion; they lived so near a warning-off notice that they could afford to take no risks.

This dispute was whether the horse should be scientifically left at the post or (as the jockey suggested) whether all risks should be eliminated by a small dose of a certain drug before the race. Both men were foreseeing certain contingencies; for if the horse were left, the jockey was to blame, and if the stewards thought the animal had been "doctored" and there was an inquiry, the trainer would most certainly depart from the turf with some violence.