Dissolution

Dissolution is the first book in the War of the Spider Queen series.

"Menzoberranzan the Mighty.

City of grandeur and cruelty, home of deadly swordsmen and diabolical necromancers, the brightest jewel of the vast subterranean world called the Underdark, and proudest achievement of the sinister race known as the drow, Menzoberranzan is a place with a mystery at its heart, a secret flaw that threatens to destroy it.

When the power that sustains the city is cut off at its source, enemies flood in from the darkness all around. And what greater enemy could a drow imagine than another drow?"