This book gripped me much more from the start than did City of Bones, although it helped that I already had a grasp of the Shadow World. I was concerned with Will's character at first because I suspected he would just be a Victorian version of Jace, but Clare did a great job of writing new and unique characters to fill this earlier Shadowhunter world.
Too few questions about Will's past and reasons for his behavior were answered for my taste, but I loved Tessa. I loved that the main character was not a Shadowhunter.
SPOILERS AHEAD.

I'm dying to know how Tessa fits in to the modern Shadowhunter world with Clary and Jace because I can't think of anytime that she's been mentioned and I've read through City of Lost Souls. Can't wait for the next few books!