Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Wilkins' tooth

The revenge business (or "own back" business) isn't as easy as the two main characters - Frank and Jess find in this funny novel. As the story progresses they discover that people around them are not what they seem. Their main enemies are Buster with his (black and blue swearword) gang, and Biddy Iremonger. Diana Wynne Jones uses her usual twists and turns, with false leads and many problems caused by just one tooth. Frank and Jess end up trying to solve alot more than one puzzle. Great story!