Della (1964)

Della Chappell is a very wealthy and incredibly reclusive woman. When a big company wants to develop some land that Della owns, the town sends out Barney Stafford to talk to her. She invites Barney over to negotiate the proposal. Barney soon takes a liking to Della's equally reclusive daughter Jenny Chappell. After spending some time with Jenny, he realizes that Della has a dark secret, one that keeps them from the outside world.