Ran this as a first-time DM and it went pretty well! Kinda wish there was more combat, but then again it's supposed to be more investigative than combative. Wish I read through it more to really grasp how it all works. Running it a second time will definitely be better. On the player side, one of them noted how it just felt like a lot of rolling investigation checks, and I don't know if that's just how I ran it or if that's just how that works. In addition, Velma has advantage on all of those checks, and she was never in combat (until the very end) so there wasn't really a chance for her to lose her glasses. My favorite part of the adventure was how my players actually fit into their roles, and I'm not sure it was on purpose. Lastly, I feel this adventure would work well in Ravenloft, and that's how I plan on running it in the future.