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This is an easily-readable science fiction novel. It describes a society that has escaped earth, left it to be taken oven by fast-replicating and consuming nanomachines. The main character -- a shoemaker and sort of citizen journalist (I call em "bloggers") -- joins a mission to go back to Earth to place some detectors.

This book is good enough, but it doesn't really go into any depth about the issues it covers. There's a little bit on another society that split off from the main one, it probes an almost-religious aspect to people leaving their earthly form and merging into a mass consciousness, and so on. I would rather the book actually explore the interesting aspects of those in more detail, or just leave them out completely.

Some parts of plot seemed sort of bogus to me. Apparently, the main society has hardly any contact with the other one -- I understand they're split by huge distances, but no one would pay attention to the most interesting aspects? That in itself isn't that important, but enough little things like that interrupted my enjoyment of this book.