‘Thirty years had passed since I last interviewed Sharon Henderson. In 1992 I was sent to her flat on the Wear Garth estate in Sunderland after her seven-year-old daughter, Nikki, was murdered. The following year I covered the trial of George Heron, whose confessions were ruled inadmissible on the grounds that the police interviews had been ‘oppressive’. And then, one day last year, I stumbled on this paragraph: ‘David Boyd, 54, of Chesterton Court, Stockton, Teesside, has been charged with the murder of Nikki Allan.’ And I knew I was going back to Wearside.