Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Exciting and thought-provoking!

I love any book dealing with the legendary Illuminati (which I believe, to some degree, actually exists in some form or another). And Dan Brown, as usual, created a great story with plenty of intrigue as well as plot twists. It's only problem might be in the fact it was a bit too long. Sometimes it is better to have exciting books a little faster in pace and shorter in pages, such as "Darkeye". Though not as great a book as "Angels and Demons", it is a good example of how you can have an exciting book without too many pages to deal with.