Andy embarks on an inspiring journey back to Scotland, exploring Rosslyn Chapel and its intriguing connection to the Holy Grail, as made famous in the Da Vinci Code books. He meets comedian Billy Kirkwood at a cave believed to house a legendary beast and uncovers the story of Scotland's most infamous witch, while also visiting Yester Castle, a remarkable structure built by a local necromancer with the help of a goblin horde. Delving into the mysteries of the Falkirk Triangle, a global UFO hotspot, Andy learns about a frightening abduction and participates in a UFO nightwatch. His adventure continues as he tests his remote submersible in the depths of Loch Morar and Loch Ness, and he explores the story of Felicity the puma, the only big cat ever captured in Britain, discovering the decaying remains of the trap that once held her in a hidden, overgrown forest.