Adam Forrester is a London scientist with a very unprofessional secret; he is a victim of Old Hag syndrome, a cruel and humiliating visitation he has endured since a child. Having lost hope his torment will ever leave, Adam undertakes an expedition to the Scottish Highlands, entering the realm of the legendary Fear Liath Mòr, a giant spectre known for terrifying climbers on Ben Macdui. His task is to learn more on the dark side of the spirit world, desperate to manufacture a scenario of chaos that might break the hold his abusers have over him. But is his arrival on the cold and perilous heights of Britain’s most remote national park really his idea, why is his American colleague Becky involved, and what does it all have to do with M Theory?