2/2. Nuuk, the capital of Greenland, is a startling mix of traditional culture and modern urban problems. Visitors can watch the Northern Lights to the accompaniment of drunken heckling in the city centre behind them, and spot whales just yards from blocks of depressed social housing. Nuuk is also a town where criminals and their victims may meet on the street, days after an assault. Clive Anderson discovers that open prisons are the only prisons in Greenland, as he concludes his investigation into the way the law there is implemented. Producer Sarah Jane Hall