from the Introduction:
Caves of Sydwall is an AD&D 2nd Edition compatible adventure designed for 4-6 characters of levels 7–9 (average 40 total levels).
from the back cover:
Years ago, an evil wizard settled down in a complex of caves, far away from the town where he was exiled. Soon after, the adventurers started coming, thanks to an old sage and his book. For most, it was the promise of treasure. For some, it was a mission. For others, it was a sacred place.
None ever returned.
Now, it has fallen upon you to journey to the caves, to discover what lies within. Your reasons are your own, but despite the peril, you and your friends set off towards the Tharuss Hills, and the... Caves of Sydwall