This book is right up my street. Essentially a technothriller set in the near future where nano-based drugs have enabled people to build an OS on top of the brain and interconnect. From that setup we're sent around the world in an international espionage mission. There's a few subplots too addressing various issues centred around the military. Throughout the characters are put into difficult situations and tested to the maximum. Ramaz Naam clearly knows his science and manages to squeeze in a lot of 'could happen' extrapolations without bogging the story down too much with dull facts or explanations.
I would have given the book 4 stars, but I'm afraid I was annoyed by the editing and formatting. I'm used to a few errors in ebooks as it seems most publishers still haven't nailed the process yet, but this one had so many errors within it (I can't speak for the print), that I was frequently pulled out of the story.
For the benefit of the publishers the errors were: typos, inconsistent formatting of internal/nexus dialogue, hyphens where there shouldn't be any, and sometimes none where there should, missing words, and inconsisten italics. The hyphens were mostly a problem in the Thai names; sometimes they were there, other times they weren't (in the same name).