Instruct: Classify a given review into positive or negative sentiment.
Query: excellent mystery

This is a great first novel. Quite accurate in psychological aspects. A little different as there were few "twists and turns" as it was more a "police procedural". The characters were well developed and believable and real. I am looking forward to his next. Well look for his website and see what is forthcoming. Long and held my attention. Very well written.