“Rowling’s authorship was revealed by The Sunday Times after it investigated how a first-time author “with a background in the army and the civilian security industry” could write such an assured debut novel.” You’d think that a city as grey and hopeless as London wouldn’t be able to produce the high-watt sunlight that really makes you regret your high-proof mistakes. Maybe that’s why you can’t throw a crumpled-up newspaper without hitting a drunk in The…