Joe Navarro writes practical non-fiction about body language, behavioural observation and interpersonal risk, drawing on his former work in the FBI. What Every BODY Is Saying explains how posture, feet, hands, facial behaviour and other nonverbal signals can indicate comfort, stress or changes in emotional state, while repeatedly warning that individual cues need context rather than serving as automatic proof of deception. The Dictionary of Body Language turns those observations into a reference-style guide, and Dangerous Personalities focuses on behavioural patterns associated with people who may be manipulative or harmful. Navarro's books are structured around examples, categories and signs to watch for, with an accessible tone rather than academic psychology. Navarro is best shelved under body language, behavioural observation and practical communication. The books are for readers trying to notice patterns in work or everyday relationships, not for making clinical diagnoses from a gesture or facial expression. Read more Less