Every other year or so since 1964, loyal readers pick up their new Anne Tyler novel as they would buy a favored brand of sensible shoe. Each of her nine books is solidly constructed from authentic and durable materials. Yet traditional style and comfort do not necessarily mean dullness. Tyler's characters have character: quirks, odd angles of vision, colorful mean streaks and harmonic longings. They usually live in ordinary settings, like Baltimore, the author's current home, and do not seem to have been overly influenced by the 7 o'clock news. An issue in a Tyler novel is likely to mean a new child; a cause, the reason behind a malfunction in an appliance or a marriage.