This is book 6 in the ongoing Foreigner series, and as such it's a little hard to talk about on its own. If you haven't been reading the series, you should start back at the beginning rather than trying to pick it up in the middle. This book makes frequent references to things that have happened before, which are helpful if you have read the previous books and only need a reminder, but which I believe would just be frustrating if you didn't know what they referred to.
If you have been following this series, the early part of the book continues to belabor Bren's angst about his situation as a human more connected to alien society than human. It's at the heart of the overall story of the series, and it's interesting at one level, but at another level, it gets dull to spend so many pages on it. However, the plot does pick up steam, several things do advance, and one or two are even resolved. One chapter in the bigger story is closing, but the story continues. Some excitement and battles do occur, and some important things do happen. We're given some more food for thought on the bigger question of alienness and how humans might communicate and get along with non-humans, as well as with other humans with different cultural perspectives.
In short, it continues to do what the series has done so far; there's enough going on to continue to hold my interest, but it does suffer from being too long. I couldn't recommend starting the series based on this book, but I wouldn't recommend giving up on the basis of this book either. 7 out of 10.