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Criminologist David Wilson and guests tackle the complex problem of a killer refusing to give up answers to his crimes.

David heads to the beer-spattered streets of Glasgow鈥檚 night life, where he uncovers the victims of an unknown serial killer from the 1970s. During a six-month window, the Weekend Killer plagued the pubs and dancehalls of Glasgow in search of his next victim, and David discovers the connection between the victims.

Back in the studio, David speaks with former deputy chief constable Tom Wood, the officer in overall command of Operation Trinity, which was formed in 2004 to examine the life and crimes of Angus Sinclair. Tom explains how the almost identical circumstances of Anna Kenny, Hilda McAuley and Agnes Cooney鈥檚 murders convinced him that the perpetrator could only be Angus Sinclair.

David is joined in the studio by forensic scientist Helen Meadows, who examines the three victims and the modus operandi to see if they could have been killed by the same man. Helen also examines Angus Sinclair鈥檚 most famous victims - Christine Eadie and Helen Scott - to look for similarities that might link them to the Weekend Killer.

David鈥檚 final guest is renowned forensic psychologist Vicky Thakordas-Desai. Vicky has spent her career trying to understand the mind of a killer and she discusses why some murderers refuse, even after being caught, to own up to what they did.