It’s a great book! My wife got only a few chapters into it, said it was too scary and stopped reading. I said, “but Dear, it’s based on science and Congressional testimony, it really could happen.” Her response, “Yes, but it’s too scary.”
It’s the most likely of the scenarios that should cause one to be a prepper, in my view.
Once I got into the book, I could not put it down and read the entire book in about a day. I turned 2-3 of my friends onto the book and they had a similar reaction.