Ben Fogle meets a former carpenter who now lives alone on a private island in the Icelandic wilderness. He discusses how a struggle with alcoholism drove him to turn his back on life in the big city, and enlists Ben's aid in fishing and harvesting, as well as maintaining his yurt business. They also go swimming in the freezing waters and take a trek up the country's most famous volcano - and discover how the island could be under threat from Iceland's volatile environment.