I went into this book expecting sci-fi and nanotech, but what I got was... a lot less. The nanotech wasn't even introduced until maybe a third of the way into the book, and the main character (Jack) spent majority of his time complaining about his wife. I get that maybe the conflict with his wife was supposed to create suspense, but it just didn't do it for me. Waste of time, wouldn't recommend unless you care more about marital issues than actual science fiction.