The rules are simple: nothing supernatural; no surprise identical twins; the killer must be introduced early on (in fact, I’ve already done that and we’re not even through the first chapter yet, though I expect you may have skipped the prelims) and be a major enough character to impact the plot. That last one’s important. Gone are the days when the butler dunnit: in order to play fair, the killer must have a name, often used. To prove the point, I’ll tell you that I use the killer’s name, in all its forms, exactly 106 times from here. And, most important, the essence of every rule boils down
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