I really enjoyed this book, and have read the whole series. The plot, for those who cannot use any imagination, could be a little harder, but all the same the books are great. It has been a while since I read this book, so sorry I can't give too many details.
From what I remember, one of the characters from the last book comes across a girl, who was badly beaten, who has insomnia. This book is the story of her recovery and how she figures out who she is and her past, all with the same tone from the other books.
Sorry I can't really remember all of it, I'm going to reread it. What I do remember is that I really enjoyed the book, so much so that I went on to read the rest of the series, and am waiting for more.
I should have given 4 stars, but I gave 5 to balance out Mrs. Butthurt. The only things I could say about the books are that they have some slight grammatical errors (but what book doesn't??) and also, do not get "book 0" or basically the one called The Crystal of Mynos. That one is the introductory material, and is about 25 pages in total, and overall is unnecessary and pointless.
Sorry to post so little, I'm just defending this book, because it really is great, even if some haters don't agree.