When 22-year-old Sian O'Callaghan goes missing after a Friday night out in Swindon, Detective Superintendent Stephen Fulcher knows that he and his team must move fast to have any chance of finding her alive. While Sian's family desperately wait for news, the police search for any clues as to where she could be.

At a remote countryside location Steve Fulcher questions prime suspect Christopher Halliwell about the whereabouts of missing young woman, Sian O'Callaghan. He refuses Halliwell's requests to take him immediately to a police station and tells him that he has a chance to do the right thing and tell him where Sian is, otherwise Halliwell and his family will be "vilified" in the press.