Return the Honour to the Lady of Percival

At the races, able squire Talis persuades Pat to put her money on a horse called Percival. The horse wins, but Talis inadvertently knocks out both Percival and his jockey! To uphold the honour of Lady Pat, Talis, astride Gumbo, takes the place of the indisposed horse and rider. But he soon finds out that a modern day race meeting is quite different from a medieval tournament!