This is the second in the Breaking the Wall series, following Thirteen Orphans. The situation and characters are carried over from that book without enough explanation to make sense on their own. The ending is fair for a book in the middle of a series.
This is an interesting, if whimsical, world, and it continues to be so even though this is the second book. Some of the stuff the characters do is profound, and some of it is frustratingly shallow and motivated by the plot. Lindskold writes well, but it's not as compelling as some of her earlier books. It's been a week since I finished it, and I find that I can't remember much of the story, which suggests that it wasn't really that memorable.
6 out of 10.