LONDON — J. K. Rowling always said that the seventh Harry Potter book, “Harry Potter and the Deathly Hallows,” would be the last in the series, and so far she has kept to her word. But though she’s written many new things in the intervening nine years, including four adult novels, she’s never been able to put Harry to rest, or to leave him alone.
What’s an author to do when she once seemed to be done? Taking an approach that some fans love and others do not, Ms. Rowling has never made a secret of her continued immersion in Potter-world. Over the years, she has regularly interjected new elements into the old stories, sometimes through sudden Twitter pronouncements, sometimes by other means. (In 2007, for instance, she announced at an event at Carnegie Hall that Dumbledore, whose sexuality in the books was obscure, is in fact gay.)