Never before have so many resources been available to the family historian tracing Great War ancestors, both online and locally but the past dearth of easily accessible material has now been replaced by a blizzard of information that needs its own skills to navigate. Expert geneaologist Simon Fowler shows Richard Hone the ropes, with some surprising results. Armed with details of Richards great uncle William Pye's service between 1914 and 1918, the film sets out with battlefield historian Tim Saunders to "Find Uncle Bill" and trace his war on the Western Front to his death just weeks before the Armistice. Their journey takes them from his first battle at Loos via the Somme and Passchendaele, to his last battle and lost grave in the Ypres Salient.