The story follows a boy named Paul who becomes obsessed with the idea of luck and gambling after a conversation with his mother. Paul believes he can predict the winners of horse races by riding his rocking horse. His uncle enables his gambling in secret. When Paul wins money, he gives it to his mother, though she wants it all at once. As she spends it, the voices in the house demanding more money grow louder. Paul dies riding his rocking horse, suggesting materialism's harm. The theme is the destructive power of obsession with money and lack of love in the family.