Anticipation over the new Harry Potter book is so intense can it help but disappoint fans? “When I think about Rowling, the phrase ‘be careful what you wish for’ keeps floating unbidden into my brain. All the money in the world (and she is already richer than the Queen) cannot diminish the weight of expectation riding on her slim shoulders. Rowling has increased the dangers of disappointment by leaving a three-year gap before getting Harry’s latest adventure into the shops. When the first four volumes appeared, like clockwork, at yearly intervals, she seemed to have come up with a magic formula.”