Sovereign is an interesting and complex book. The societies presented are not that different from our own, and show humanity through different lens.
The main character, Teal Ray Stewart, is bisexual, so if you can't handle that in a character don't read this book. It isn't graphic, and there was nothing that scared me off. I'm straight and it didn't bother me.
The cultures are well developed. The technology interesting. There are some really good battles and a lot of personal development.
The Bay Royalist (of which Teal Ray is a part) are descendants of "First Star Age Man" whatever that means. They are more or less human, having altered themselves with selective breeding to attempt to create a superhuman race. They have been at it for hundreds of generations.
"Normal" humans have not been off the earth for very long, so the first star age was in our past. Interesting.
If you like intriguing sci-fi stories, and don't mind a character who loves unconditionally, regardless of gender, then this book is for you.