Has the main suspect in Britain's biggest ever missing person case cruelly taken his secrets to the grave? Detectives are convinced serial rapist and murderer John Cannan abucted and killed Fulham estate agent Suzy Lamplugh on a summers day almost 40 years ago but never had evidence to charge him. This week a Prison inquiry found Cannan died of natural causes and had been managed with respect and cared for by confident, competent staff - sadly he didn't afford the same compassion to his victims nor did he reveal to the Lamplugh family Suzy's last resting place. In this episode Professor of Criminology David Wilson and journalist Martin Frizell consider the latest update and start with an astonishing development in the case of the Beef Wellington murderer and a new lethal recipe - cookies laced with anti freeze!