When HMS Barham was torpedoed and sunk by German submarine U-331 in November 1941, a chain of events began that led to a medium being charged and imprisoned under the archaic Witchcraft Act of 1735. The Queen Elizabeth-class battleship had sunk quickly, resulting in the deaths of more than 860 officers and crew members – two-thirds of the ship's company. Following the sinking, during a séance in Portsmouth, Helen Duncan, known as Hellish Nell since childhood and the medium at the centre of this story, claimed to have spoken to the ghost of one of the sailors who perished that...