After the promotion to Police Scotland's Historic Cases Unit, Karen Pirie reopens the cold case of a murdered barmaid. Her investigation unearths flaws in the original 1995 inquiry.After the promotion to Police Scotland's Historic Cases Unit, Karen Pirie reopens the cold case of a murdered barmaid. Her investigation unearths flaws in the original 1995 inquiry.After the promotion to Police Scotland's Historic Cases Unit, Karen Pirie reopens the cold case of a murdered barmaid. Her investigation unearths flaws in the original 1995 inquiry.