The Heir Hunters take on the case of a mysterious woman from Essex. As they delve into her records, the search moves to the Midlands and the steam railway where her grandfather worked as an engine driver. With an enormous family to research, work is cut out to ensure no heirs are missed, but a group effort pays off. In Yorkshire, four sisters and brothers who lived together all their lives are the starting point for a search that uncovers a large mining family in Durham. With generations of men working in the pit, the family's heir learns that the fancy footwork of one lucky ancestor paved the way to a celebrity sporting career, and saved his life from the front lines of war.