Short answers, pulled from the story.
Shetland is an archipelago located about 170 km north of mainland Scotland, 80 km northeast of Orkney, and 220 km west of Norway. It forms the northernmost region of the United Kingdom, lying between the Atlantic Ocean to the west and the North Sea to the east.
In 1468-69, King Christian I of Denmark and Norway pledged Shetland as security for his daughter Margaret's unpaid dowry upon her marriage to James III of Scotland. The money was never paid, and in 1472 the Scottish Parliament passed an act of annexation asserting Scottish control. Scotland rejected all subsequent Danish-Norwegian attempts to reclaim the islands.
Up Helly Aa is a fire festival held annually in Shetland, with the Lerwick celebration taking place on the last Tuesday of January. In its present organised form it is just over a hundred years old. Participants dress as Vikings and burn a replica longship, celebrating the islands' Norse heritage.
The Shetland Bus was a covert Norwegian naval operation established by the Special Operations Executive in the autumn of 1940, based first at Lunna and later in Scalloway. About 30 fishing vessels made over 200 crossings of the North Sea, carrying agents, resistance instructors, and supplies into occupied Norway. Leif Larsen, the most highly decorated allied naval officer of the war, made 52 of those crossings.
The Shetland pony is a diminutive breed native to the Shetland Islands. The first written record of the pony appears in 1603 in the Court Books of Shetland. Despite its small size, it is considered the strongest of all horse breeds.
Shetland's historic language was Norn, a form of Old Norse that was spoken in the islands until the 18th century. It was gradually replaced by the Shetland dialect of Scots, known as Shetlandic. In the 2022 Scottish Census, 41 per cent of residents aged three and over considered themselves able to speak or read Scots.