The Bill (1984) : 25x62

Guest starring Ian Kelsey as Brendan Newlyn. DC Grace Dasari re-opens the investigation into an old missing person case when the sister of the woman involved holds a man at knife-point in a Soho brothel, claiming he knows where her sister is. When a body is found, Grace feels guilty that she did not devote more time to the investigation at the time of the woman's disappearance.