I will now make an apology, although I will do my best not to repeat it. (Good readers do not read fiction, after all, to put up with the author's regrets.) I will say that having read the best and worst of novels for many years, which is, to remind you, part of a good devil's education, I know by now that not even a loyal reader can stay true to an author who is ready to leave his narrative for an apparently unrelated expedition.