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

To say this is the first novel by this author, all I can say is, I'll be looking for other books by him. This is an excellent book. It grabbed my attention early on and held it until the end. I loved the way the author blended facts and fiction to arrive at a possible answer to the "missing link" question. The fact that his answer is plausible really has me thinking. And the best part is that while you read and learn, you're also very much entertained by the story. The book has it all, action, suspense, romance, and danger. I loved it!