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

I've recently discovered Bannister's Brodie Farrell series and now I can't get enough. Unlike other reviewers, I found this book completely engaging and full of surprises. For example, the major characters reveal complex personalities not portrayed in earlier books. I liked all the characters in The Depths of Solitude, including the bad guys, and I even enjoyed the sometimes cloyingly sincere Daniel.