Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: substandard book

I am a Jonathan Kellerman/Alex Delaware fan but this book is just plain awful, the worst in this series. It's boring and the character development is almost nonexistent. I actually had to force myself to finish it when halfway through I realized it wasn't going to get any better. Maybe it's time for Kellerman to start a new series.