Dark Land: Hunting the Killers

Wales is a beautiful country, but it is also a dark land, where unsolved murders still cast sinister shadows. Former Welsh police officers join forces with an elite team of criminologists and forensic psychologists to re-examine old clues – and uncover new ones – as they attempt to put to rest the unsolved mysteries that darken Wales’ rolling hills.

Official website :https://www.bbc.co.uk/programmes/m000p5p8