From the introduction:
You hold in your hands an AD&D 2e module (adventure) designed to be used in the world of Arunia or your own homebrewed campaign with very few changes.
The pages following will describe the valley of Strathwait and the long and bitter history of the dwarves who live there. It’s intended to be an October-feeling Halloween themed adventure, so its stuffed with ghosts, ghouls, and the undead.
This module includes a description of the vale, the town of Culcomb, the ruined dwarfhold of Granarhol and its crypts, and the various places around the valley. You’ll also find a timeline describing the escalation of danger in Strathwait.