The death of David Ray reveals how a father and son lived completely separate lives under the same roof for more than 50 years, and Michael Buerk and the heir hunters uncover a fascinating insight into a secretive religious sect. When the team finally track down long-lost relatives, the truth of a family tragedy is revealed, and the heirs are able to make sense of a secretive past. Meanwhile, the search for the heir to the estate of David Walker reveals astonishing acts of bravery in the face of adversity when a family member is involved in a dangerous rescue mission.