What does it take to kill someone? How do you feel afterwards? Why would you go on to keep on killing? Join Professor David Wilson and Emilia Fox as they explore the motivations and psychology behind some of the UK's most notorious serial killers They are joined by a convicted murderer, who explains what was happening in his life leading up to committing a murder, what happened in the hour the murder took place, and what happened afterwards. David and Emilia ask him if he could have gone on to kill again, and his answer is very unexpected. And Prof. Wilson and Emilia talk to screenwriter Luke Neil, who wrote crime drama Des, based on the crimes of serial murderer Dennis Nilsen. What allowed Nilsen to kill again and again? Do we understand the lesson Nilsen's crimes confronted us with? Has society changed to stop this from happening in the future? To find out, Subscribe and listen now, to If It Bleeds It Leads, with Professor David Wilson and Emilia Fox, on Global Player or wherever you get your podcasts.