Rating 3.5* out of 5. In the near future nanobots called "biomites" can cure any disease. They are artificial cells with specific purposes. The trouble with biomites is that they increase in number by themselves and when a body contains more than 50% of these artifical cells, that body is no longer considered human and "shut down".

So when Cali's little brother Nix nears the redline, is captured waiting for the inevitable, she can't just sit around and wait. No, she must save him - at any cost. She is a superb biotechnician and has many aces up her sleeve. Against her she has federal agent Anderson, who handles all shut downs. He is deeply religious and fully on board with the notion that humans with more than 50% biomites are no longer human.

I thought I knew where it was going. I did not. I thought there would be some high-handed moralizing. There was not. This book really did make me think about what makes us human and how much technology is good for us. Surprisingly good and very thought provoking.