A gambler comes to live with his sister and discovers his young nephew has a partnership with the gardener. By riding on his rocking horse, the boy is able to predict the winner of horse races. He gives the gardener the name of the winning horse, and the gardener bets money on it for the both of them. The uncle gets in on this action by taking the boy to the races and getting the names of the winning horses, too. Meanwhile, the boy's mother becomes more and more desperate for money, making the boy all the more frantic to predict the winners.
—J. Spurlin