Having just quoted P.D. James on the subject of sex, I should also recommend this little tutorial in mystery writing. "A first class mystery should also be a first class novel," says Baroness James, which is why she is one of my all-time favorite authors. Anyone interested in writing fiction could do a lot worse than studying her brilliant Adam Dalgliesh novels. These are exquisitely written, unflinchingly honest, and relentlessly entertaining books.