What is the theme in Witness in Death by Nora Roberts?

Revenge is central to the novel WITNESS IN DEATH. Richard Draco is murdered on stage during opening night at the New Globe Theater. The play, "Witness for the Prosecution" had Draco playing the role of an evil man, one who uses his wife to protest his innocence and casting her aside for another woman. The prop knife that was to have been plunged into Draco's shoulder is switched, and a real knife is instead plunged into the actor's heart, killing him.