First in our true crime specials.  Local historian, Dr Fiona-Jane Brown presents one of Aberdeen's famous unsolved murder cases, that of 18-year-old Betty Hadden, apparently murdered on 12 December 1945, as only her forearm was ever found, the fate of the rest of her remains a mystery.  She was last seen in Torry walking down Crombie Road late at night; her arm was found on the foreshore near the foot of St Fittick's Road by retired cooper, Alexander King, who was walking his dog.  Police scoured the whole area to no avail, they never found out who it was that had been heard screaming around 2am on the 12th either.  Detectives kept one lone house under surveillance for a fortnight after Betty's arm was found, but were unable to make an arrest due to lack of evidence.  So, who killed this 1940s party girl?