From publisher blurb:
A shadow from the past, the Ghost Tower of Inverness has loomed ever larger in the mind of the great Seer of Urnst. Now he has convinced the Duke that an expedition should be organized to go to the ancient keep and recover its greatest treasure - the fabled Soul Gem.
The module was originally written for the Official Advanced Dungeons & Dragons Game Tournament at Wintercon VIII, held in Detroit in November of 1979. It is the second in the Competition Series - adventures that were used in official tournaments. This adventure contains a challenging setting, a scouring system and characters specially prepared for the adventure. It may thus be used for competition among players (or groups of players), or as a non-scored adventure included in an ongoing campaign. Also included within are background information, referee's maps and notes, encounter descriptions for players, and a background scenario linked to the World of Greyhawk Fantasy World Setting.