An Eagle in the Snow

1940: A train is under attack from German fighters. Sheltering in a tunnel, the stranger in the carriage with Barney and his mother tells them a story of a young soldier in the trenches of World War I who, on the spur of the moment, did what he thought was the right thing. It turned out to have been the worst mistake he could have ever made — and one which he must put right before it is too late.