4/4. A look at how unfinished historical business continues to shape the present. In the spring of 1948, 28 000 children walked across the mountains of northern Greece into Albania, Yugoslavia and Bulgaria. They expected to return to their villages within weeks or months, but many found themselves locked out of their homeland for decades. James Maw travels from Athens to Skopje, talking to those whose lives were changed forever by the bitter divisions of the Greek civil war.