Instruct: Classify a review into positive or negative sentiment.
Query: Have you heard of tunnel vision?

This book is very disappointing. I was even appalled at the nerve of the author to re-release this book and identify the man he THINKS is the Zodiac killer after the man's death. The author actually demonstrates how an investigation can get botched with tunnel vision. A prime suspect is the sole focus and evidence is distorted any way it can be to "prove" this suspect is the Zodiac killer. There were other possible leads and suspects that were discounted by the author.By the time you reach the middle of the book, you'll see it is already obvious who the author THINKS is the Zodiac killer. The rest of the book discounts other leads and suspects and focuses on "evidence" that "proves" the author has identified the Zodiac Killer. Very disheartening.It should be noted the author is not an investigator and the identity of the Zodiac killer remains a mystery to this day. The author has NOT proven his "identification" of the Zodiac killer. This book is a shame.