John Scalzi is an excellent writer. This is eminently readable and highly enjoyable.
In this sequel to Old Man's War, we spend our time with the special forces. A military scientist has betrayed humanity and gone to work with an alliance of species that are planning an attack on the human worlds. When the plan to copy the traitor and ask the memory-enhanced clone does not work, he is placed in combat where he can be useful or die trying. Then memories begin to emerge.
The main note is quality of writing. It is just a pleasure to read John Scalzi, an effortless flight through carefully crafted work. He does well in friendship and introspection, he does well in sex and violence. There is variety in settings and activities, and it is all good.
The variety is baked right in. As in Old Man's War, thousands of worlds are just a skip drive jump away, in addition to training, different operations, and squad "turnover" in a wartime military story. Things move, things change, and the writing remains excellent.
There is some introspection time to consider the implications of the plot background. I am being intentionally vague to avoid spoiling the first book, but I have already said that our protagonist is a man-made human. That is important, as is being made with a built-in brain-computer interface. The latter is addressed in Old Man's War and gets more attention here.
The book falls short in being conservative about the implications. The story remains human, which is good storytelling but sells its characters short. When it is explicit that we have a transhuman cast, keeping the thought and discussion on a human scale is a disappointment. There are early indications that things are working at a different speed on a different scale, but then nothing comes of it, and the characters default to human behavioral norms despite being raised without them.
I can understand wanting to be human because of having been created as a non-human Other. Maybe that is meant to be implicit, but multiple characters explicitly reject it, and I expect them to act more fully on being high-bandwidth digital telepaths with hive mind potential. Little else is done with that idea after the revelation that it makes for really great sex.
My other criticism is that our returning character from Old Man's War does not add much from the original. This was the case in Marooned in Realtime as well: the character is there in name, and it is the same character, but it fails to build. That is great for someone entering on this book without having read the first, but the setting does build on the previous book, so we have character re-use without character advancement. This would be less notable if the point of view did not shift to that character at times; if we stuck with our protagonist exclusively, the inability to see inside others' heads would resolve that. Except that they can see inside each others' heads.
Moving past criticism, we have the neutral point that some pieces are obvious tropes or adaptations. Mr. Scalzi cites some of them himself, such as borrowing "uplift." Bad artists borrow, good artists steal. You can also see the sci fi fandom and geekery as the characters enjoy our modern books. They suggest that sci fi died as a genre once space travel was possible and they saw what the universe was like, but it reads suspiciously like a list of the author's favorite books. Other tropes exist, such as the trick from training that becomes critical later, although with a few variations.
Wait, no, one more criticism stemming from "they saw what the universe was like." I have mentioned in other books the difficulty of remaining just a little transhuman for hundreds of years. Maybe adding hundreds of enemy species puts economic pressure that slows that, but it should certainly add distance in other directions. The book addresses my point from last time, why not use all/mostly special forces, but "they creep us out" does not outweigh the cost and effectiveness benefits when at war with 90% of the galaxy. (If anything, the costs for special forces are even lower than implied in the first book.) Humanity would have been wiped out, and a species that engages in preemptive intergalactic terrorism hardly seems like it would have any scruples against tactics that undermine its own humanity. On the other hand, humanity is doing a middling job of not bullying the dragon, and I am waiting for the story about a special forces rebellion.
That there are details to think and argue about is a good thing. Many stories require suspension of disbelief such that you must forgive pretty much everything to get started. It takes this level of coherence for thoughts deeper than the awesomeness of laser swords. In a thinking person's action-adventure story, we think. And maybe the next explanation will patch it instead of opening new questions.
Although, new questions are great sequel hooks. A few of the characters note problems, like Eurocentrism given the rest of the setting, and I am willing to give John Scalzi the benefit of the doubt that he has thought through some things (rather than just lampshade hanging).
While I may argue some plot points (and the author has already won, so who cares?), and that only happens when the plot is good and thoughtful enough to be worth arguing, the writing is less subject to criticism. John Scalzi does a great job bouncing from familial love to the horrors of war. We have philosophical discussion next to comic relief in a way that works.
Pretty much everything works. He is just that good. I still think of John Scalzi as one of the new lights in science fiction, and he is perhaps the brightest.
Amazon link