In 1984, Detective Eric O'Malley investigated the bizarre deaths of a young couple, their bodies found naked by the side of a creek in Sydney's northern suburbs. Shortly before their demise, O'Malley learned, the pair had attended a swingers' party. The case was barely open before it was deemed an accident. But O'Malley knew it was murder. He just couldn't prove it. Thirty-five years later, O'Malley is found dead in his flat in what looks...