An area is unearthed with evidence of WW1 mortar bombs. Its position reveals it as a 'trench mortar pit', key to the Allied taking of “Hill 70”, a strategic position in Northern France in the summer of 1917. A search begins for the tight-knit band of brothers who fought there and reveals the name of a Canadian soldier. As the Trench Detectives close in on how he came to be there, they uncover the moving Dickensian story of a “Barnardo Boy”. The soldier was the eldest of three children rescued from the crushing slums of a Northern steel town in Victorian Britain and shipped to Canada where the children were separated and scattered across the country. None were told where the others were, but all were bound by a strong desire to reunite.