When a man confesses that a woman is lying dead in his house, police must establish whether she died as a result of an accident or if she was murdered. And a look into the Crimewatch archives. Detectives and forensic experts describe how Pembrokeshire killer John Cooper was finally found guilty of murder, decades after he committed his crimes. Advances in forensic technology finally helped police crack these two infamous double murder cases.

Police dismantle an organised crime group using trafficked women in a network of brothels across Glasgow. And we delve into the Crimewatch archives to see how police caught the murderer of Suzanne Pilley.