Different entities, old powers, mind parasites (hopefully symbiotic), flesh metal hybridization, dangerous artifacts, 2 badass fighter femme fatales, ancient sentient superweapons, a short glimpse at Chasm City, and good old potential apocalypse in the hardest space opera out there in the endless and manifold dimensions of known, accessible to humans, Sci-Fi.
I am not sure who invented the idea of bio nano fusions by technology, viruses, xenoviruses, weaponized viruses, computer viruses, or good old magic, but how the idea of robots or humans using the technology or being assimilated by it is shown here in very detailed descriptions is mindblowing.
The factions are already in play, still not so relevant as in the following novels, but completely worth a look in specific wikis. Reynolds created a kind of Sci-Fi counterpart to hopeless dark fantasy worlds. I can´t mention much about the ways technologies and ways of living in space formed their culture, body, and ideology, because discovering the world and inhabitants is one of the greatest joys in Reynolds´ work and large sections of the books are dedicated to them.
One notices that Reynolds writing style is just at the beginning, there are more lengths, this and the second one are partly more of detective mystery stories than space operas, just with „Who are the evil aliens, what is that strange artifact for?“ premises instead of real, hard science fiction space opera with fractions, big wars, and alien invasions in the second, main plotline.
Reynolds is immensely sharp in his writing, a perfectionistic plotter, fine tuner, and planer that he is. Dialogues and plot twists are interlinked and combined like in a good action movie, McGuffins and Chekhovs everywhere, cleverly placed reminders, must have taken him a while to tune this trough.
The plot is clever, the finale one of the most epic moments in Sci-Fi, although it can get a bit confusing with the characters, their motivations, and who is why doing what. I don´t really care much about characters, Reynolds doesn´t too, which leads to this little problem of making their motivations credible to fit to the main plot that is driven by the other, meta plot forces.
In comparison, Reynolds is by far the hardest science fiction focused out of the Space opera trio that lead the genre for a while together with Banks and Hamilton before the new kids on the Sci-Fi block arrived and occupied their territory with much easier to access works. Although Hamilton may be the closest to the Expanse, Neal Asher, and others who are cool and chilled, Banks and Reynolds are just too heavy, not to ever mention Stephenson, even I am not sure if I should dare to reread his work and I am a total Sci-Fi nut.
However, if you are not into very detailed astronomy, astrophysics, and astronomy and find no joy in training your skimming and scanning techniques by searching the pearls in very long passages, this might be nothing for you. I love how the hard science I often don´t really understand is integrated into plot concepts and finding these intersections while enjoying the ride with different reading speeds gives me the perverse, strange, masochistic flow. But Reynolds is unique, no other author with a similar science background and a dark, grim, wasted future, cyberpunk, dystopian, misanthropic, hardboiled, badass setting, characters, and writing style I know out there.
Even for me, a Sci-Fioholic, this is something time intensive and difficult to read, because one has to invest the effort to be able to enjoy it. For the ones who are just lurking into Sci-Fi, it might be too much, but for the already a bit more experienced readers, elysium could be waiting.
Worthless, boring, personal anecdote that can easily be ignored to save time: Í´m at the moment (since late spring 2020) rereading the mentioned Banks, Reynolds, and Hamilton and it´s funny how I keep saying to myself that if I finish reading some more difficult Reynolds, I´ll reward myself with some lengthy, easygoing Hamilton or much more optimistic, but not so funny, except the Minds, Banks.