Evil Stalks This House (1981)

Jack Palance stars as a selfserving abusive boor who becomes stranded along with his two children by a thunderstorm forcing them to take shelter in an isolated country estate owned by a group of mysterious and wealthy old dowagers Seeing a golden opportunity Palance soon turns to plundering their estate but his plans collide with the secret activities of a Satanic snakecult who carry out ritual sacrifices in the attic