This final episode in this gripping series tonight which follows real-life missing person stories from the perspective of both the police tasked with finding them and the family members at home. In tonight's episode, suffering from advancing dementia and heartbroken over the recent death of his wife, 82-year-old Archie has vanished, leaving no sign of his whereabouts. PC Geoff Moore and the team have to get as much information as possible from his son Peter, who went to visit his father at home one morning to find his house empty. The police launch a full-scale land and air search in the hunt to find Archie, but when a neighbour comes forward with CCTV of activity outside his home, the police begin to suspect foul play.