Nice sidestory. I was expecting to find out more about Abby and how she became who she is later on. However, this wasn’t about that side of the story really. Maybe it’s all explained in one of the normal books I haven’t read yet. I’m now looking forward again to reading more of the series during the summer!
For those who are reading this as a standalone book: it really isn’t. Without the depth of the normal series, the events become too shallow for what they actually represent. I really recommend NOT starting off with this book; instead: treat it like an appendix. Otherwise, it would be such a shame to drop the entire series based on not liking this one!