From the introduction:
For many years the mighty walls of Castle Sigisman have been empty of all but shadows. The halls of the great fortress have echoed only to moans of the past. Will the Blasted Heath ever be recovered? And can the spirits be driven from their ill-gotten home? The answers must be sought within the Castle of Sigisman.
Castle of Sigisman is designed for play using the rules of the fantasy role-playing game of your choice. It is ideal for mid-level (level 3-6) fighters, clerics, wizards, rogues or thieves. Any character races may be played. This is a full length multi-player adventure with maps and notes for G.M.'s.