Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Interesting and well-paced fantasy

The book has some flaws, most notably that you don't have any idea until the end that the book might be the first of a series, (if it sells well). It's fun, lighthearted fare, and the author makes some serious points along the way about what might happen when reality and fantasy become indistinguishable. I found it well worth my time, and enjoyed myself along the way.