The War of the Spider Queen spreads...
A hand-picked team of the most capable drow adventurers begin a perilous journey through the treacherous Underdark, all the while surrounded by the chaos of war. Their path will take them through the very heart of darkness, and the Underdark will be shaken to its core. If the powerful dark elves falter, the world below is open for Insurrection.
Wizards of the Coast
R.A. Salvatore's War of the Spider Queen, Book II