Yorkshire, 1974. Britain is in recession, the oil crisis and black outs loom large. The Maynard family move into their dream house, only to find a "presence" already living there. Len, Jenny and their daughter Sally must struggle to keep their already-fragile family together as they are attacked by poltergeists. Soon it becomes apparent that Sally is their main focus of attention. The house becomes a living nightmare. They must exorcise the evil spirits for them to survive...