Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Most informative book on 9/11 yet...

Excellent book. I think this is one of the most informative, well-documented and unbiased books written about 9/11. It's heavy reading and takes concentration to follow, but it's well worth it. In fact, I took notes throughout reading it. It tells the story of 9/11 in chronological order. Even has background on the terrorists and their families as well as victims, survivors, and their families. I high recommend this book--just not vacation reading!