Satan's Slave

A woman driving her parents to her uncle's house crashes near the house. Her parents die but she survives. She stays with her uncle, but it becomes clear that he and his son are planning something sinister for her.

Satan's Slave is a 1979 drama horror movie directed by Norman J. Warren, starring Michael Gough, Candace Glendenning, Barbara Kellerman. It holds an IMDb rating of 5.3/10 from 2,499 votes and runs 1h 26m.