From publisher blurb:
This module features ghostly spirits to fight, deadly traps to be overcome, and rare and amazing treasures to be earned. This SSD universal game supplement is suitable for use with MOST fantasy role-playing game systems.
4-8 hours of play for 4-8 adventurers 9th-12th level. (Expert Level) DM Map, Monsters, Traps and Treasure included. (Some very unusual, but not unbalancing for lower level characters.)