Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Incredible read!

What a great book! I enjoyed it very much. No, it wasn't what I thought it was going to be, but that's good, because it was actually more than I had expected! A modern-day "Journey to the Center of the Earth". Great characters, harrowing adventure, and something for the mind to mull over aftewards. I read the first chapter late at night. Not a good idea. I was afraid to turn off the lights! If there's a sequel, will defintely read it.