Keeper of the Lost Cities: Unraveled by Shannon Messenger was highly anticipated by both myself and my daughter. I was a bit frustrated when I learned that we were getting another .5 book (especially knowing that my librarian doesn't think .5 books are important to include in the library's collection) instead of book 10, especially with the way the author left us at the end of Stellarlune.
(If you haven't read Stellarlune, you might not want to read this review as I will be mentioning some things that would be spoilerish for that book.)
I really do feel like she is dragging this series out more than she needs to. And I didn't start reading until right before Flashback was published.
That said, I did love being able to discover what Keefe was up to in "Humanland" during the time that took place in Stellarlune. The book did seem a bit repetitive at first as he was trying to deal with being separated from everything he has ever known, and dealing with the new abilities his mother forced upon him. In Stellarlune, when we finally see him again, he has a lot better control, so it was cool to see how he went about that.
I loved seeing his reaction to all the different human things. I will say the book became a lot more interesting when we discover the identity of the "friend" he mentions when Sophie and friends find him in Stellarlune.
I've seen some reviews that make it sound like this book isn't as important as the author has made us think it is. I have to disagree with those reviews. I think we definitely discovered some important information and I can see why she didn't feel like she could work it in to book 10. I can see why it was important to have this in Keefe's point of view, especially because there are things we learn he still won't be able to share with Sophie.
I will say, I did miss Ro and all the hilarious dialogue and interactions between the two of them. And it was definitely different having Keefe all sulky, but very understandable.
Now if the author hadn't decided to include those mentions of controversial relationships. I admit, I've been wondering for a while, with all the issues with the elves' matchmaking rules, if she was working up to including said relationships, even though she has said in the past they wouldn't be in this series because it didn't fit in with her world. But seeing as there was a certain conversation beween Keefe and his "friend," and the mention of those relationships being "cool," I do feel she is planning to bring that into her world. Which really frustrates and saddens me, because I have been recommending this series in Christian groups for ages, but now I will no longer be able to do so.
Will I read the rest of the series? Of course. I am invested, and I love this series. And that is one of the things that bugs me the most. The author let us get invested and then threw it in where it really wasn't even needed.