Baroness P.D. James is approaching ninety and showing no sign of slowing down. Her series of novels starring Detective Adam Dalgleish are some of the finest in the genre, therefore I was looking forward to her insight in Talking About Detective Fiction, (I admit it: one day I’d love to make a stab at a who-done-it myself). But despite being well-written, she didn’t drill down into craft. After a breezy five chapter tour through the historical development of the mystery, lightly summarizing the strengths and weaknesses of its most famous proponents (Conan Doyle, Sayers, Rankin etc.) she ends with a mere single chapter on craft, before dissolving into speculative chit-chat.