From the publishers blurb:
This is an OSRIC adventure for characters of 10th to 14th level of experience.
The cult of Il’gathach was once a powerful religious order. Temples of Il’gathach could be found all over the realm. Rumors of dark rituals and evil rites led to it’s downfall. Before the end there were rumors that the sect intended to assassinate the king and take over the land. The king crushed this sect with his armies to preserve order and perhaps his own life.
The sect has not been heard from now for hundreds of years. A few ruins and relics of their order can still be found for those who know where to look for them. One such place is a long forgotten cave complex once used as a temple to their order.
There are a few whispers about the cult making a return. Children have gone missing. Strange symbols have been painted in prominent places across the land. Rumors of their imminent return are on the mind of many in the land today. No one knows for sure if there is any truth to any of them.