Instruct: Classify Amazon reviews into positive or negative sentiment
Query: If you own a gun then you need to read this book.

"In the Gravest Extreme" is an excellent resource. It provides you with the information that you need to be a responsible gun owner. It gives you the information that you need to save your life on the streets and in the Courts. It carefully explores what makes a self-defense shooting justifiable (both morally and legally). It is jammed with excellent information. For anyone who carries a gun, this is one of the "must reads" in self-defense. It is the best $9.95 that you will ever spend.