Murdered, missing, unidentified … the tragic stories that inspire Britain’s cold case investigators

When Dave Grimstead left the police after more than 30 years, he knew just what he wanted to do: solve some of its most intractable mysteries. The founder of Locate International explains why the country needs him and his volunteers

When it comes to cold cases, crime dramas get a lot wrong. “In reality, you’d never reach the end in nine neat episodes, all wrapped up, with a timeline that moved nicely along, building tension,” says Dave Grimstead, who spent more than 30 years in the police. Real cold cases are rollercoasters of false leads, rabbit holes and dead ends. “They’re never solved by one heroic detective, either,” Grimstead adds. “It requires a much bigger team than you see on TV.” But one cliche does ring true – the detective who can’t give up. Most will have at least one unsolved case that stays with them long after the spotlight has moved elsewhere. In a free moment, they will find themselves following a lead, putting in calls. Decades later, they might still wake up thinking about it.

One of these cases, for Grimstead, was the disappearance of Melanie Hall in June 1996. Hall was 25 and never came home from Cadillacs, a nightclub in Bath where she was last seen arguing with her boyfriend. Grimstead was a detective constable in Avon and Somerset’s major crime team at that time, and what began as a missing person investigation soon began to resemble a murder inquiry. Hundreds of hours of interviews and CCTV footage, searches, reconstructions and TV appeals failed to reveal what had happened to Hall. In 2009, one of Grimstead’s supervisors, Mike Britton, was still investigating it, fitting it round his caseload, when her body was found in a bin liner beside the M5. Although this happened just days before Britton’s retirement, he cancelled his plans so he could work on the case as a civilian investigator. It is still unsolved.