From the back of the module:
Lolth's avatar has come to Menzoberranzan, declaring the god's intent to spin a Demon Weave and gain control of arcane magic. The drow rush to aid her by retrieving ancient artifacts and channeling their power to Lolth. But in Menzoberranzan, the City of Intrigue, nothing is ever as simple as it seems. The Council of Spiders demands representation for wizards on the Ruling Council of the drow theocracy. Tension rises between priestesses and wizards in a drow battle of the sexes. Will the tension erupt into civil war? Which side will you choose?
Council of Spiders is a Dungeons & Dragons Roleplaying Game adventure designed for the summer 2012 season of the D&D Encounters official play program. In this season, participants are encouraged to play drow characters as they vie for supremacy in the Underdark. This season incorporates lore from Menzoberranzan: City of Intrigue. The adventure comes with three full color battle maps, eight ready to play encounters, and information on the D&D Encounters program.