The book tells the story of three fierce black-clad robbers who terrorize and plunder the countryside, armed with a blunderbuss, a pepper blower, and a huge red axe. One night, they meet a small girl called Tiffany, who is on her way to live with a wicked aunt. Tiffany is delighted to meet the robbers, and they take her back to their hideout in place of their usual haul of gold and jewels. Tiffany asks what they plan to do with their riches, but the robbers had never thought about spending money before. They soon find themselves embarking on a completely new career: they gather all of the lost, unhappy, and abandoned children that they can find, and then they buy a big castle so they can give all of the children a happy home.