Andy McGrath visits one of Edinburgh's eerie vaults and encounters an inexplicable ghostly phenomenon. He retraces the steps of notorious serial killers Burke and Hare, explores the story of Felicity the puma, the only big cat ever captured in Britain, and discovers the decaying remains of the trap that once captured her, hidden in an overgrown forest. Later, he travels to the battlefield of Culloden to highlight how this significant battle profoundly impacted Scotland's future before heading to Lochs Morar and Ness to test his remote submersible in the depths of these infamous monster lakes