Instruct: Classify a given review into positive or negative sentiment.
Query: Great Book!

Fevreblau is a great book! I thoroughly enjoyed reading it. Once I began I had to keep reading to the excellent ending. The story is fascinating and puts a very unique spin on the future. The characterization is first rate and you really love the main character, Nikolai.Sci-fi fans will enjoy this book very much. It's a quick read and the payoff is great. I can't wait for more books by Kenneth Mark Hoover. Bravo!