Kaitlyn Dunnett/Kathy Lynn Emerson here, pondering why so many publishers of cozy mystery series, including humorous mysteries, think Christmas is a good time to commit murder. In real life, of course, there are plenty of homicides over the holidays, mostly committed by those nearest and dearest to the victim. Not to make light of it, but stress is a killer. This year, with large family gatherings being discouraged due to Covid-19, it will be interesting to see if Christmas crime statistics are much different from the norm. Getting back to fictional murder and mayhem, let me tell you about my...