Instruct: Classify a given review into positive or negative sentiment.
Query: Not so great, but still thrilling

I have read many Dean Knootz's books. Velocity is the one I enjoyed the least. The plot is interesting but weak. I cannot understand why in hell they did not report to the police and just play on with the killers' game. The ending is weak also. I will not recommend it. Try Life Expectancy or Odd Thomas, and you will be rewarded with a much stronger, much more interesting and more humane story.