A newly rich couple, under the impression that Cockney racing tout Evans is a championship-winning trainer (he isn't), ask him if he can train a racehorse they have just bought. It turns out that they don't know anything about horse racing, but think that having a championship racehorse will be their ticket into "society". Evans agrees, but since he doesn't have a stable, moves the horse into the quarters he shares with two lodgers. Surprisingly, the horse has an innate talent for racing and could well be a champion. Evans enters him in the big championship race, but the day before it is to take place, the horse is stolen.