Sally Magnusson presents a series that goes behind the scenes at police forces' Missing Persons Units across the UK and looks at baffling cases from the National Missing Persons Helpline. 27-year-old Paul Balmforth was an aspiring young writer and fitness fanatic who disappeared in February 2000 during a late-night run. A brother and sister have found a death certificate and want to find out it's the brother they haven't seen since 1964.