The coastguard helicopter takes a 24-year-old oil rig worker to Lerwick for urgent medical treatment. After appendicitis is diagnosed, he's rushed into surgery. A 64-year-old member of the Jarl Squad, stars of the annual fire festival Up Helly Aa, comes in to A&E complaining of breathlessness. The cause turns out to be a deadly blood clot, discovered in the nick of time. And community nurse Margaret Cooper gets an introduction to Out Skerries, one of Shetland's more remote islands.