In this episode, both heir hunts involve a tough time on the front line uncovering long-forgotten tales of families reshaped by world conflicts. In a case with its roots planted firmly in London's East End, the team investigates an immigrant Jewish family who survived the horrors of Europe to endure the devastation of London in the Blitz. In Hatfield, Hertfordshire, one of the firm's travelling researchers struggles to find any clues from neighbours about a retired factory worker whose father survived a World War I prisoner of war camp. When the family tree begins to grow, it's an emotional journey for heirs who learn how their father's heroic army deeds made him one of World War II's silent heroes.