A new play based on the abduction of Japanese citizens to North Korea has been captivating and educating audiences at the National Theatre in London.

"The Great Wave," which tells the fictional story of one family's fight to find out what happened to their missing daughter, has received rave reviews in newspapers and sheds light on a story little-known in Britain.

"I wanted to tell the story of a family caught up in a political situation," says playwright Francis Turnly, who is half-Japanese and half-Northern Irish. "I think it's the first play about the abductions in English."