Is there any genre Rowling cannot master?

OPINION: Perhaps most surprising about the news JK Rowling wrote The Cuckoo’s Calling under the pseudonym of Robert Galbraith is not that she should take a fake name or that she should write a crime novel – after all there were plenty of nasty goings-on in the Harry Potter books – but that she would have the time to write it given her first official novel for adults, the much anticipated The Casual Vacancy, was published only late last year. The Galbraith book slipped under the radar in this country but received positive reviews in Britain when it was published in April.