This podcast episode explores the complex phenomenon of serial killers, with a focus on serial sexual murderers. It delves into the motivations and psychodynamics of different types of serial killers, highlighting the fusion of sex and aggression in serial sexual murder. The episode also discusses the challenges in defining and categorizing serial sexual murder, as well as the rarity of scientific research on the topic. The podcast addresses the distinctions between psychopathy, sociopathy, and antisocial personality disorder, and their relationship to serial killing. It also sheds light on the surprising fact that many serial killers are married or in committed relationships, emphasizing their ability to maintain a "mask of normality". The episode concludes by discussing the elusive world of female serial sexual murderers and the challenges of profiling and understanding these offenders.