"I don't know why I write. The honest answer is that I don't have an answer. I wouldn't die if I couldn't write fiction. Actually keel over and die - it's unlikely. But quite quickly writing has come to feel like the only thing I really know how to do. And I go a bit stir crazy if I don't write more or less every day. But that makes writing sound like a mood-regulator, a way to regulate anxiety or depression, and it doesn't really come down to that."