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After reading the book for the 2nd time. I would say that the book in short is "multum in parvo" or concise and comprehensive.
The authors did too much effort to gather all aspects of ISIS in about 200 pages, they discussed the history, ideology, strategies, media, propaganda, governance, economy, etc.
If I should recommend a reading about ISIS it will definitely be "ISIS: Inside the Army of Terror."
Note: I still didn't read Stern & Berger's book nor Loretta Napoleoni's new publication but I believe they will be of value too.