it was well written (and translated of course!) throughout. there were a couple of over-running sentences in the first few chapters, but they seemed to get shorter as the book went on, or more likely i just got used to them.
i read it in one sitting, as the mysterious plot drew me in very well.
i liked the constant flitting between multiple story-lines, mirroing what the protagonists would have been feeling, being kept in the dark for most of the story.
unfortunately, due to this back-and-forth, and no backstory or build up to speak of, i didnt really identify or care too much about Nik or Viktor, although Viktor having a present family for much of the book made him a bit more likeable.
the 'hidden' figures - Georgiy and Refat - were actually more interesting, as the people who seemed to have more of an idea of what the hell was going on.
the ending was a shame, and, again, not caring too much about the protagonists made it a bit perfunctory.
not a bad read, but something that would need another going over to make sense of, and i dont think i liked it enough to do so.