From the introduction:
The shepherd was almost asleep when he heard the sounds. Strange sounds, too, he thought as he rose from his bed. The sheep were moving around in their pens and making all kinds of noise, but there were other noises out there. Some kind of moaning or groaning could be heard above the sheep's bleats...
For 15th level characters.
The scenario was published as six consecutive posts to a mailing list, comprising a single scenario. In the adventure, the Free City of Greyhawk offers a substantive monetary reward to anyone who locates and destroys the source of a recent outbreak of various types of undead.