'On the whole, it was easier than I had expected. Only once did I feel myself at risk. That was when the Inspector suddenly intervened. He said in a harsh voice: "He married your wife, didn't he? Took her away from you some people might say. Nice piece of goods, too, by the look of her. Didn't you feel any grievance?"I had been expecting this question. I knew exactly what I would say.'The late, great P. D. James takes us inside the mind of a murderer.