Unhinged

Unhinged (1982) is a horror, mystery directed by Don Gronquist rated 4.8/10.

College students Terry, Nancy, and Gloria, on their way to a rock concert, crash their car in a torrential rainstorm, badly injuring one of them. Rescued from the car, they are provided with recuperation in a house occupied by a man-hating mother and her daughter…but all is not what it seems.