The Seven hear about an old man called Tolly, who lives in a tumbledown house on the top of a hill, with his horse Brownie and his dog, Codger. But Brownie is almost lame from hard work and the vet's bill was more than Tolly could afford, and the owner of the horse wants him to be shot! But help is at hand for Tolly, Brownie and his dog, as the Seven find somewhere safe for them all to stay and Peter's father buys Brownie from his horrid farm owner, Mr Dinneford. And everyone is so pleased when Brownie is a great help with some awful horse thieves!