What is the theme in The Best of Roald Dahl by Roald Dahl?

Justice is another theme in the book. Many of the the stories in "The Best of Roald Dahl," revolve around a bad or deceitful person getting what they deserved. In at least five of the stories, that applies to a married couple. Mary Maloney in "Lamb to the Slaughter" and Mrs. Foster in "The Way to Heaven" both orchestrate their husband's deaths as a way to get back at the men for the torment they caused their wives. William, Mary's husband is "William and Mary," is kept alive as only a brain and an eye, but Mary gets her revenge because her husband now has to watch her enjoy all the things he had previously forbidden.