Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Excellent mystery

This book was great fun. The author definitely knows how to write a mystery/thriller. Any book that has a good enough command of plot that I don't want to put it down gets major kudos from me. What sets this book apart however is that unlike many thrillers, the characters and their emotional responses to events aren't as two dimensional as in so many books of this genre. The author delves deeply into what motivates the protagonist and his enemies and allies, but he doesn't make a point of it, and so we as readers get to know the characters without realizing it. The depth of the writing doesn't take away from the fast-paced nature of the plot. So I'm glad I discovered this author and I'll certainly be sure to check out his other books soon.