When police investigated a potential serial killer, on the streets of Manchester, England, they feared they had an even bigger problem. The evidence pointed to TWO killers, operating at the same time, in the same city. This episode tells the story of one of the UK's lesser known, but most dangerous murderers, and how he used a nail file to avoid detection and continue his killing spree - fooling forensic officers until the horrific truth finally came to light. Learn more about your ad choices. Visit megaphone.fm/adchoices