This is a work of nonfiction plus some speculation. It's largely about drones and their very rapid miniaturization, their present and coming use in law enforcement and war, and a potential future in which spy and communication equipment will literally be the size of dust motes, almost impossible to see and impossible to escape.
It's also about the complete lack of privacy that is coming in the future.
Parts of the book are encouraging, detailing how such devices will help rescue people after disasters, help people escape the control of repressive governments, and simply communicate more easily with one another. But most of the book is chilling indeed, portraying a future that will be very, very different from our past.
What's really important is that this is NOT a work of science fiction. Many of the devices described here either exist already or are in the development stage.
No matter where you fall on the political spectrum, you need to read this book, because to know the future is to help yourself prepare for it.