Has anyone toyed with the idea of inserting the Skinsaw Murders after Harrowstone? I've read Harrowstone and I just picked up the Skinsaw Murders the other day because from the description, the initial part of the adventure, the investigating of the Foxglove Manor, sounded like it'd fit in pretty good after Harrowstone. Instead of bouncing around from classic monster (Frankenstein, werewolves, Lovecraftian, and vampires), with Skinsaw Murders, I could run my own AP of ghostbusting PCs. I haven't read all of the Skinsaw Murders, but I do know that it moves away from the haunted Manor to investigate agents of the Runelord. I figure if I can find another AP or module to fit in after, I could tie the rest of the Skinsaw Murders to that one.
I think adding elements from Skinsaw would work well, though it does travel away from Foxglove mannor. The rest could probably be incorporated if you don't mind a bit of work with the logic conversion.
I DMed Skinsaw Murder and indeed I think it would fit well in the mix.
When I inserted the manor in the campaign, I did add a reason to visit the manor (and then discover why it is haunted and all the cool SM backstory).
So you could design a sidequest where the PCs have to visit the manor (rumor, or whatever information the Whispering Dudes are hiding there). Not everything PCs do has to be 100 % relevant to the quest! There should be sidetrek quest and red herrings!
Joël