Like one of the previous reviewers, I too have noticed that Baxter's latter books seem to be turning inward, and although a real fan of the hardcore space opera, this has, and continues to be a fascinating exploration.
This books is gritty, harrowing, depressing, but totally un-put-downable.
It certainly gives you a sense of your personal insignificance and I came away from this book feeling awed. Baxter seems to be moving away from the airy Clarkian optmism of mankind uber alles; moving away from the pre-Copernican ideas of making man central to universe, to a probably more realistic view that in the total scheme of things we, as a race will probably not count for much in the long run.
It's is like Baxter has taken to the logical and somewhat bleak conclusion that which Copernicus started and Darwin continued.
Ultimately I feel this book is optimistic. Baxter seems to believe that life will always endure, and I, personally feel reassured by that.
Unlike a previous reviewer, I hope Baxter can go further with this exploration of life. I just cannot see where he can go next.
Utterly recommend this. Brilliant, and those who accuse hard sci-fi of being for adolescents - read this and grow up!
PS Baxter says: respect your mamma!