Vimes considered this input and said, ‘Well, you might be right.’ Then, out of nowhere, possibly some deep hole, a thought struck him, just as it had many times before, sometimes in nightmares. ‘I wonder if any author has thought about the relationship between the hunter and the hunted, the policeman and the mysterious killer, the lawman who must think like a criminal sometimes in order to do his job, and may be unpleasantly surprised at how good he is at such thinking, perhaps. Just an idea, you understand,’ he said lamely, and wondered where the hell it had come from.

— Snuff by Terry Pratchett (17%)