I loved Greta and the Goblin King, and have been excited to read this for ages. The book picks up pretty much where the first one ended. You're immediately thrown in to their world and their new set of problems.
Greta is pretty cool! She has to find a balance between being kick-butt and letting others take the lead. Greta has tons of problems in this book, but deals with them well. She never gives up hope, even when everyone else already has. Isaac isn't in this as much. I love the scenes with him, and love seeing him and Greta together!
While I think the writing could have been a little better (I noticed lots of common things, etc), it was overall pretty good! The story flowed well and kept me hanging until the very last page. The one thing I might have hoped for was a little down time between action scenes. They would defeat one thing, and then immediately something else would happen.
Much of the world building occurred in the first book, so this didn't require as much. That said, Greta was going on a whole new journey to new places that hadn't been explained before. I really enjoyed seeing the new places and seeing how they dealt with all the obstacles they came across. I wish I could have seen more of the Glass Kingdom though, as that seems like a pretty interesting place.
Originally written at: http://www.tween2teenbooks.com/2015/02/blog-tour-greta-and-glass-kingdom-by.html