Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great Thriller

I have read 4 Steve Berry novels, and this one is probably the best, slightly ahead of The Third Secret. For those that find the idea of a 21st Century Czar unfathomable, you will have a hard time enjoying this novel.However, for those who aren't that familiar with Russian history will find this both informative and entertaining.Just like in The Third Secret, Berry does a terrific job of intertwining factual history with pure fiction to create a very entertaining story.I highly recommend this book.