Documentary telling the tragic story of the greatest loss of fathers in British history. When the nation was called to arms in the patriotic fervour of 1914 it was difficult to imagine that, four years later, half a million children would have lost their fathers in battle. The impact of their deaths was devastating and never forgotten by their sons and daughters. Now in their 90s, they go on an emotional journey to remember their lost fathers, culminating in a visit to their graves in France.