I found this book to be a very through, un-sensationalistic look at body language. There are no outrageous claims ("Determine if your spouse is cheating by studying his eyebrows!!") and Navarro goes out of his way to reinforce that body language can't stand in for a lie detector. After reading the section on hands, especially, I became more aware of my own movements and what they might be communicating to the people around me.The writing style is clear and easy to understand without being overly casual. Pictures and interesting stories from Navarro's time as an FBI agent pepper each chapter.If you want to become very good at reading nonverbal tells you can do so by diligently studying this book but even the casual reader has much to gain from its pages.