1980s. In the beautiful, unspoiled landscape of Pembrokeshire, a serial killer is at large: two double murders; an assault; the rape and assault of two teenagers – all potentially the work of one man. This is the fascinating true story of a brutal murderer and the detectives who worked the cold case for six years in order to bring him to justice. Combining cutting edge forensic techniques with old fashioned detective work, a team of detectives worked to build a case against their prime suspect. But it was a race against time: would he strike again? No one could predict that the killer’s appearance on the gameshow Bullseye would provide bizarre but crucial evidence.