The year was 1963. A group of adventurous teenage boys descend into the depths of an abandoned iron ore mine near Barrow in Furness, in the north-west of England. Their mission is to explore the labyrinth of tunnels beneath "The Vale of the Deadly Nightshade." The mines of Yarleside/Parkhouse are not far from the once rich and powerful Cistercian Abbey, St Mary of Furness: Their adventures lead them to discover many ancient mysteries and secrets including...