She has been compared to Voldemort, the murderous villain of her own novels, and has described being sent “enough death threats to paper my house”. So you might reasonably expect that J.K. Rowling would be cautious of unsolicited letters plopping onto her doormat.

What’s more, with the author having only spoken a handful of times since posting a series of tweets that have led her to become a lightning rod in the row over issues affecting trans people, the chances that she would reply to an interview request from a stranger over the Atlantic must have seemed even more remote.