Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It's a real art

Brown shows how he has worked the field as a private investigator. His book helped me to understand the experience requirements for private investigators and the fact that it is an art. This is an area where a detective type of person can achieve peak performance and make a difference.The subject of pretexting was, I think, the most important in this book. A successful pretext will save lots of resources for other needed areas such as expensive surveillance. I think a good private investigator will use all the techniques required to be cost efficient, enabling lengthier and more complex engagements.This is a perfect book for those wanting to become private investigators. It's useful information for just about anybody as well.