Evil Stalks This House (1981)

Self-serving, abusive boor Stokes and his two children become stranded 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, Stokes turns to plundering their estate, but his plans collide with the secret activities of a Satanic snake-cult who carry out ritual sacrifices in the attic.

TV Movie, Horror, Thriller