From the back cover:
She sits at the center of her Web, a dark force of intense evil power. Her strands reach across Oerth, through the Crystalmist mountains, across the embattled human kingdoms, and even reaching the councils of Pomarj and beyond.
The adventure began in The Temple of Elemental Evil, and continued with Scourge of the Slavelords. It now comes to a climax as the dark forces begin to move against all mankind.
This product contains revised material that originally appeared in modules G1 (Steading of the Hill Giant Chief), G2 (Glacial Rift of the Frost Giant Jarl), G3 (Hall of the Fire Giant King), D1 (Descent into the Depths of the Earth), D2 (Shrine of the Kuo-Toa), D3 (Vault of the Drow), and Q1 (Queen of the Demonweb Pits). New material for further adventures is also included. You can use this adventure alone, or as the conclusion of the series.