S1, E1: In the early hours of Wednesday 7th August 1985, police in Chelmsford receive a phone call from farmer Jeremy Bamber. Jeremy's sister Sheila, mother June, father Nevill and twin nephews Nicholas and Daniel are all found dead at White House Farm. The case appears to be open-and-shut: Sheila, who had mental health problems, is responsible for killing her parents and children, and then herself. But for DS Stan Jones, something doesn't feel right.