This is probably one of my favourite modules. The extra modules and information found over at Dragonsfoot are gold!
The other 2 adventures in the original series are:
I wrote a bit of a twist on Bone Hill awhile ago, you can read it here.
If you would like to throw a tweak in on one of the main NPCs try checking out the below witch twists post:
Here's Grognardia's retrospective on the adventure: http://grognardia.blogspot.com/2009/11/retrospective-secret-of-bone-hill.html
Honestly one of the best adventures out there, I love the sandbox elements and the mini dungeons.
You can grab a copy of the adventure here