|Scarlet Witch scores a crit!|
I went to the internet to see if others had run a campaign using this module and any reviews of it that might be helpful in running the game in general. I found this blog The Restenford Project that discusses the module and provides some interesting insights and suppositions to the rumors tables and the NPCs in the module. This really helps to flesh out the sparse NPC backgrounds and provides some food for thought.
Though it is never really stated what exactly the "secret" of Bone Hill is, there are certainly mysteries within that an enterprising DM can expand upon.