An American whose grandfather was a German photographer in WW1 is searching for the families of Prisoners of War he photographed.
Johh Heinsen has already travelled to Merseyside to meet the grand-daughter of Captain Thomas Box.
The captain was one of 30 British Prisoners snapped in a photograph taken in 1917.
Now the search is on to identify the others.
Our correspondent Amy Welch was at today's emotional meeting.
If you recognise any of the men in the photograph please click here for more information.