I HAVE. no castmates to offer you but since your josing for a horror game i figured id point to a couple places.

I don't play there any more, so it would be hard for me to give you clear insight about it, but exitvoid gets a lot closer to the plot-a-week theme that you're looking for. I think theres a 1:2 day ratio and every in game week theres a little sub plot to get involved with. the big events are like any other, but also rifts, which youll have to look at, but the last one I was in was pretty dead space i believe!!! the game shifts settings every year also. it's a neat setting id check it out!! -and there also appears to be an elementary sherlock there.

OTHERWISE i would point you toward havenrpg where i do play!! and haven is wonderful, ive never met a nicer playerbase than this one. It's survival horror, with some like TRULY horror plots going on that are absolutely fantastic. theres experiments and yao and sluethy stuff. we used to have a small sherlock cast but they dropped a little bit ago (and im still sad about that because sherlock is so amazing), but id certainly love to see john there!! apps are processed i think on the 16th so you have time! and i can answer any questions you have about this game \o/