This is an informative and compact book with interviews from a wide range or sources, including actual ISIS members. It's thoroughly researched and well written and is dense with information. Unfortunately the history of violence in the middle east and the US involvement there is so complex that this book isn't enough to cover all the bases. I usually prefer shorter books but this is one subject that requires a tome to touch on everything. I recommend this book to someone who already has some solid background information on ISIS and is just looking for something extra. If your coming into this book with nothing but what the news has been telling you about ISIS, you're going to need charts and maps to keep all the names and places straight in your head.