Documentary exploring the nature of psychopaths, using cutting-edge science to reveal what makes them so different to others. Forensic psychiatrist Tony Maden shares his own specially commissioned personality profiles and assessments of psychopaths and the programme showcases the research being undertaken to understand the condition. The first edition features case studies of serial killers Joanna Dennehy and Dennis Nilsen, as well as convicted murderer John Cannan, while Maden also meets armed robber Noel `Razor' Smith.