George is a disaster-prone stablehand with a whistle that can make Hotspur, the cup favourite, run even faster. When a couple of crooks discover his secret, they attempt to drug the horse, but George manages to accidentally foil them. In the end, he helps Hotspur win the big race. A secondary storyline involves a young girl who agrees to marry an aging suitor if his horse defeats Hotspur. George's timely whistle also saves her from the awful fate she inexplicably tempted.