Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not one of his best

I'm happy to hear it wasn't just me that thought Monster was not one of Kellerman's better efforts. I am an avid fan of this series and this book left me wondering what happened. I had trouble keeping interested in this plot and that has never happened before. It had very little of the usual drama and twists and turns of an Alex Delaware/Milo Sturgis investigation. I hope his next effort is better. I would hate to think that this series has come to an end.