Maria V. Snyder, you did a much better job with Storm Glass than with Fire Study.
A gorgeous cover like this is a good start, eh? Seriously, I love it--and it's an excellent cover for the book, too. There were lots of glass orbs in this novel and it's nice to have a clear image in your head when you start reading about them.
Storm Glass ties in Opal from Fire Study. She has a gift with magic and glass....but isn't sure what her powers exactly are. Because I'm feeling lazy, here's an edited description from Amazon:
As a glassmaker and a magician-in-training, Opal Cowen understands trial by fire. Now it's time to test her mettle. Someone has sabotaged the Stormdancer clan's glass orbs, killing their most powerful magicians. The Stormdancers require Opal's unique talents to prevent it happening again. But when the mission goes awry, Opal must tap in to a new kind of magic as stunningly potent as it is frightening. With lives hanging in the balance—including her own—Opal must control powers she hadn't known she possessed…powers that might lead to disaster beyond anything she's ever known.
Throw in a little loooooove interest(s) and you've got yourself a good tale. The book does tie in nicely with Yelena's story, too.
I'm being generous giving it an 8, mainly because I was able to guess what was partially going to happen. (I don't like guessing---surprise me, authors!) However, it managed to wipe away the horror of Fire Study so that's a plus.