Crime in high places is his specialty, and much of Mr. Dunne's fiction has a common theme: rich people, aided by expensive defense lawyers, getting away with murder. A subject that gnaws at him, it has been his crusade ever since the killer ex-boyfriend of his 22-year-old daughter, Dominique, was released after serving 2 1/2 years of a 6 1/2-year year manslaughter sentence.