Hellfire Farm finds an artist, his wife and their young children living in a rural idyll in a farmhouse in the Welsh hills. But their dream home becomes a nightmarish crucible of demonic activity which drives the family apart. Liz and her partner - artist Bill Rich - move into a farm house nestling in the hills of the Brecon Beacons in Wales. Two children arrive in quick succession. Liz collects a menagerie of rescued farm animals. Bill at last has a proper studio space. But things start to go sour: objects move around the house inexplicably; animals begin to die; Bill's artwork stops selling.