The team travel to the Shetland Islands to visit a remote outcrop known as the Kame of Isbister that has a series of enigmatic structures. They are the first archaeological team ever to investigate the crumbling headland, and with the fast rate of erosion possibly the last. They hope to prove the settlement was either a Monastic retreat or a leper colony. What they discover surprises everyone.

The team travels to Culzean Castle in Scotland. Built on a headland the castle stands over a series of caves whose occupation and use remains unclear. The team discovers human remains and legends of cannibals inhabiting the caves resurface. Undaunted the team continues their work eventually unraveling the story of the remains, and the source of much of the human activity evident in the caves.

In south west Wales the chance discovery of ancient coffins weathering out of a cliff face entice the team to examine who the graves belong to and how many people are actually buried in the area. As evidence is uncovered many of the team go through strange emotions as the truth about the site is revealed.

The team returns to the Shetland Islands, this time to investigate an iron age fortress known as Burgi Geos. Just getting the site proves a nightmare as the crew must cross some of the deepest peat bogs in Europe. As the team begins investigations it becomes more apparent that the site was far more than a simple fort. But why was there a community to protect in the first place.