This book offers a practical approach to understanding subtle cues in human behavior: from eye movements, jaw tension, and shoulder contractions to changes in vocal tone. Based on the expertise of Vidar Hansen—known in the media as the "Norwegian Sherlock Holmes"—it aids in investigations and helps courts distinguish between truth and lies. The book focuses on training readers to practice conscious observation, read context, and build a comprehensive picture before making judgments, without relying on rigid rules.