I had planned to write a scene where details are revealed of a pathologist’s report of a post-mortem he’d performed on a murdered man. In the old days, this would have meant weeks tracking down an amenable expert willing to spare thirty minutes for my questions. More likely, I would have glossed over the medical specifics with vague atmospheric details. You know the sort of thing. The DCI says, “What we have here is a man murdered when his attacker stabs him in the stomach with some kind of...