There seems to be a lot of criticism of this book as not revealing anything not already reported, but in my view it does a service by pulling the various and disparate reports together in a readable narrative. Actually, it says right in the book that it consists of previous essays rewritten and strung together in a narrative.
One of the characters in the narrative is Edward Snowden, the well-publicized leaker of a trove of secrets held by the National Security Agency, and now a full-time resident of Russia, out of reach of US authorities. I have my own background in military intelligence (closely related to NSA) and US Army Special Forces, so I did not take kindly to Snowden's action to break his security clearance oath at the time. But, I must admit in this context it does not look as bad as I thought.
A powerful theme in the book is the tracing of the enormous, astounding growth of the US security and intelligence establishment. If you are not aware of this history this book would be a good way to get an important insight into what is happening to create the surveillance state. And related to this we need to pay attention to the spreading of the US special operation forces into hundreds of locations around the globe, whether invited or not, and to the warfare operations by remotely controlled drones, all carried out by extensive military, intelligence, and contractor groups that are by no means under citizen control.
Another interesting angle I saw here was how the US remains on a complete war footing, despite the demise of the Soviet Union, as if it is protecting us from a doomsday enemy, when in fact our enemies are mostly small bands of lightly equipped terrorists and/or tiny countries that could not carry on a war ten miles outside their own borders. Yet Americans are psychologically conditioned to regard the entire world as a fearful place. There is not much mention here about the growth of militarism in China since it much of it has occurred more recently, and in any case it is nowhere near as powerful as we are led to believe.
So, despite the many weak reviews of this book I think it is a very worthwhile read to gain better view of what our government is doing in the form of the gigantic security state embedded in many secret agencies.