Insurrection - Thomas M. Reid

The first book set the stage for disaster and introduced all the main players in this story.  But this book gets to the heart of the action, leading the main characters (certainly not protagonists; I'm sure they'd be offended) out of Menzoberranzan to Ched Nasad - The City of Shimmering Webs. 

There a city is built upwards from thick, stone-like webbing.  It would surely be a marvel to behold.  The main characters seemed impressed enough.

So far in the tale we have three females total to the group - Quenthal, sister to the Matron Mother Baenre, and to Gromph, her would-be assassin from the previous book.  Hallistra, the now homeless Matron Mother Melarn (her mother killed in an attempted coup on the part of Ambassador Faeryl's House).  And finally, the lovely Danifae, battle captive and bound to Hallistra.  Hallistra relies heavily on the servant, who seems to want nothing more than to kill her mistress and return to her home city, betraying a level of weakness that is...unsettling to see in a drow.

The males who tend to their demanding females are at current count three as well - Pharaun, the mouthy mage who in the previous book betrayed his "friend" Ryld.  Ryld himself seems now (after surviving the betrayal) to keep an eye on his old buddy more often than not.  And Valas, the scout who joins them on their journey at Matron Baenre's "request" is often quiet, disappearing at the drop of the hat only to reappear at extremely plot-convenient times.

In this book, you see the fall of Ched Nasad into a completely chaotic wreck.  While Menzoberranzan put their political differences aside when the revolt came, Ched Nasad Houses only wreaked more havoc with their wrestling for power.  Ultimately, it looked like the entire city fell apart completely.  Crushed beneath the weight of burning stone and giant fucking spiders.