From the Back of the Book:
Deep below the surface realm, in the perpetual gloom of the Underdark, the drow conspire to subjugate the world in the name of their dread spider goddess. No other race can match their malice and cruelty. No other race holds a candle to their ruthless depravity and thirst for power. Their cities are dark and twisted cradles of treachery and corruption, their myriad schemes a tangled web that snares all who defy the will of Lolth.
This Dungeons & Dragons supplement presents the definitive treatise on the dark elves. Within these pages, you'll find insights into drow culture and society, rules and options for drow characters, new equipment prestige classes, feats, magic items, and monsters, as well as a detailed exploration of the fabled drow city of Erelhei-Cinlu.