A stranger snatching a child off the street is thankfully a rare thing. But throughout the 70s and 80s, in England, Scotland and Northern Ireland, a number of young girls disappeared as if into thin air while walking alone. Most went missing in broad daylight. Some were found – their bodies dumped hundreds of miles from home. Some remain missing, presumed murdered.

In 1990, police in Scotland realised that many of these cases were linked. A delivery driver living in London was responsible for them all. Despite getting into trouble throughout his youth for sexually motivated attacks on younger children, Robert Black had been free to roam the country and target girls for decades.

*Episode Image: Jennifer Cardy (via The Irish Times Archive)