The series investigated some of the most baffling and intriguing murders in Northern and Central Scotland, where the killers have never been caught and in some cases, the bodies never found.

The show was a contributory factor in police deciding to dig up a quarry as part of the investigation into the murder of Renee MacRae and her son Andrew, and while their bodies were never found, Northern Constabulary filed a report to the procurator fiscal naming the person responsible.

Wilson states: "I didn't set out to prove Tobin was Bible John but I would stake my professional reputation on it.

"[3] Former Black Watch sniper Michael Ross, who was 15 at the time of the crime was sentenced to a minimum of 25 years for the 1994 murder of Shamsuddin Mahmood in 2008.

[4] In January 2013, forensic experts exhumed a grave in a Coatbridge cemetery in the hope of finding the remains of Moira Anderson who vanished in 1957.

[10] In December 2023, Robert O'Brien, 45, Andrew Kelly, 44, and Donna Marie Brand, 44, were convicted of Caroline Glachan's murder.