"The Psychopath Test" is a book by journalist Jon Ronson that explores the concept of psychopathy and how it is diagnosed. The book delves into the Hare Psychopathy Checklist, a tool used by mental health professionals to assess psychopathic traits in individuals. Ronson investigates the implications of labeling someone as a psychopath and the impact it has on society. Throughout the narrative, Ronson shares his experiences with various individuals, including mental health experts and those labeled as psychopaths. He raises questions about the nature of sanity and the fine line between normal behavior and psychopathic tendencies, prompting readers to reflect on their own perceptions of morality and mental health.