From the back cover:
Snakepipe Hollow is a large and flexible RuneOuest scenario pack, designed to supply dozens of adventures for a band of adventurers. Eight "starting points" supply different motives and rationales for expeditions, as well as necessary non-player character statistics. A WILDERNESS ENCOUNTER section provides background data, a map of the Hollow, NPC stats for a variety of individuals and parties roaming in or passing through the area, and extensive notes on the intent or motivation of the beings. The underground adventures are divided into three interlocking lengthy caverns, each of which will require more than one expedition to throughly explore. The halls and courts of this great complex are presented in a uniquely structured fashion which allows referees to reveal major and minor details separately, without misplaced emphasis, depending on how the players themselves pace their activities. Each element possibly existing in an area is always presented in the same sequence and clearly identified, so that maximum use may be gotten from the material.