RogerBW runs his own murder mystery scenario, which had its first public outing at the 2018 YSDC Games Day.
Session 01 - Do They Have Any Toffee?: Called out on a Saturday morning to a manor house in the Fen country, the great detective faces a distinctly strange challenge.
Session 02 - Rummaging in Drawers: The investigation continues, with a curious fixation on milk-churns.
Session 03 - We’ve Got A Suspect, But It’s Definitely Not Him: Last time they lost a child. This time they find one. (Background effects provided by the Consumption Ward.)
Session 04 - Take the Wet One: As the flood waters rise, our heroes track down a murderer, or perhaps more than one.
The PCs were actually created by someone else who posts here, whom I will not out unless they wish to speak up. (I changed one of the names to fit better with my conception of the character, but I didn’t spot anything odd about that one.)
Session 03 - We’ve Got A Suspect, But It’s Definitely Not Him: Last time they lost a child. This time they find one. (Background effects provided by the Consumption Ward.)
*So, uh, Roger… How come your guest bedroom is full of books on, ah…"
“My collection of textbooks about serial killers, you mean? Oh, I just keep them there to make my guests feel welcome.”
*…B-beg pardon?!"
“Well, y’see, first I sorted through my ENTIRE book collection, and put all the LEAST upsetting and disturbing volumes in the spare bedroom.”
“…”
“It works, it really does! Whenever I have visitors over who say they need a place to stay for a couple of weeks, they always leave after a single night - that’s how relaxing it is! They get a month’s rest in just a few hours, I’m sure!”
I use Library of Congress for the nonfiction. It minimized the number of decisions required, and I’ve used LoC so much that I can readily find almost any topic on my shelves.
The standard in the UK is Dewey Decimal, but I’ve not had enough to do with it to make it come naturally. (Also, last time I looked there was no free version of the standard.)