Robert Jones was the GP in the Essex town of Coggeshall, where he lived with his 35-year-old wife Diane. They first met as doctor and patient and started an affair, but in July 1983, Diane vanished. Three months later her body was discovered in woodland. Suspicion centred on her husband again and again, but he was never charged. This documentary uses new evidence from detectives, friends, lovers and neighbours to reveal Diane Jones's secrets and how she and her upstanding doctor husband lived a life that was nothing like it appeared