Instruct: Classify the given review as either positive or negative.
Query: Thought provoking

I bought the book because of the high ratings others had given it. When Kelly stuck with the technical and social aspect of the story, it flowed well. When he advanced into the cloak-and-dagger or military fields, I felt it bogged down. All in all, I think it was a good treatment of the subject, although I think he was rather optomistic about how soon the power gets back on. Also, the action centers around southern California. He did not deal with how people in the northern or midwest states are going to cope with a complete loss of energy of all types in the middle of winter.