Instruct: Classify the given review into positive or negative sentiment.
Query: Not the best of this series

I found this to be the weakest of the three books in this series. Without giving away the plot, I will say that the professor gets into a situation that, while humorous, is just too improbable to sustain itself well. Other reviewers have compared this series to the works of P.G. Wodehouse. There is something of that same dreamy quality to the stories, with characters whose feelings of social propriety and personal embarrassment make it difficult for them to avoid or escape awkward situations. Smith does a good job of creating characters who are sympathetic despite their flaws. But there is a feeling of something missing. Here, he never reaches the depth that he achieved in his "Ladies Detective Agency" series, and he doesn't provide enough humor to compensate for that.