The Iron King by Julie Kagawa
"I didn't scream this time, but came very close. As it was, I nearly fell out of the tree. Hugging a branch, I looked around wildly, trying to determine the owner of the voice, but I glimpsed nothing but leaves and sickly gray light shining through the branches."
I've got about 100 pages left in this book and I've really enjoyed it. The story is very interesting and full of adventure. It's taken me a little longer to read than I expected, but I'm looking forward to finding out what happens in the end.