Out of all the books in the Homecoming series, this one had the most prevalent religious overtones in it. Because of this, I found it hard to get into the story. It was also hard to understand the context in which this book was presented, as what your reading takes place after humans from Harmony have returned to Earth and even after they've re-populated. You have numerous new characters to become acquainted with and it takes some getting used to remember their names and relationships with each other.
Going back to the religious overtones, you really can't miss them. It felt like Card was trying way too hard to bring his message about God across to you and pretty blatantly, I might add.
I also feel cheated in reading the supposed last volume in this series. While the book was a fantastic story, it does not answer any of my questions and does conclude the series for me.
What about the angels, diggers and humans? What's the point of them and their assumed symbiotic relationship? You never really find out, except for the answer that, "it's what the Keeper wants."
I had high hopes for this last book, but it fell short. A good book, in and of itself, but not the book that should have ended the series.