Greyhawk, is besieged with enemies within and without. The forces of Iuz the Demon Lord have over run the Shield Lands and hold the north shore of Nyr Dyv. Riders of flying reptiles have been spied from the city walls. The Cycle of Eight have not been seen for months. The adventurers have arrived in the Green Dragon Inn in and are hired to help the citizen's of Greyhawk investigate and fight the many hidden cults that have risen within their midst. These enemies from within threaten to over turn the Oligarchy and open the gates wide for the forces of Iuz.