Psychopathy is a disorder embedded in mystique, controversy and fantasy. Consistently portrayed in the media and popular culture as unusual, inhumane and emotionless creatures, individuals with psychopathy are the bogeyman of today’s society, and the label psychopathy is used widely to describe a broad range of notorieties from political figures to serial killers. This timely new book separates fact from fiction. It presents the scientific facts of psychopathy and antisocial behavior, addressing critical issues such as the definition of psychopathy, the number of psychopathic individuals in society, whether they can be treated, and whether psychopathy is down to nature or nurture. More controversially, the authors present their ground-breaking research into whether an underlying abnormality in brain development, reducing emotional learning, is at the heart of the disorder. The resulting theory could lead to early diagnosis and revolutionize the way society, the media, and the state both view and contend with psychopaths in our midst.