The theory of lies is now at the peak of popularity; the plots of many books and television series are based on it. The book you are holding in your hands expands your understanding of this theory. You will learn to determine not only how sincere the interlocutor is with you, but also to understand his hidden motives, secret feelings, desires and fears. 50 rules will help you sensitively capture the nuances of the internal state of your interlocutor by his speech, facial expressions, and posture. This way, you can always protect yourself in communication and achieve what you want in your personal life, family, and work.