Radio 1 presenter Sian Eleri investigates a seemingly ordinary farmhouse in north Wales, which, in the late 1990s, was widely considered the most haunted house in Britain. The story made local and national headlines as the family who lived at the farm became ever more desperate in their search for answers. More than 300 allegedly paranormal events were documented at the Flintshire farmhouse in video footage, audio interviews, photos and eyewitness accounts – all of which has been locked away until now. Reports ranged from words and pictures appearing and disappearing on the walls, to objects moving around the house. Multiple witnesses reported seeing a hooded figure and the ghost of a girl rumoured to be buried in the garden. With exclusive access to the case archive and to those at the heart of the case, Sian – who was raised in north Wales - sets out to uncover what really happened at Penyffordd Farm.