They were going to rape her one by one. She was going to kill them....one by one.

The House by the Lake (1976)

Directed by William Fruet

Harry is a rich dentist who often brings women up to his rural lakehouse. One weekend, he invites Diane, a former fashion model. On their way to the house, Diane runs a gang of thugs off the road. Humiliated, the thugs track down the couple for revenge.