Behind Locked Doors (1968)

What Was the Terrifying Secret of the Cellar?

Terry and Ann are two "swingers" who spend the night in a spooky old house, where they're subjected to bizarre sexual experiments by Mr Bradley and his deranged sister.

• Parental Guidance: PG-13
• Release Date: 1968-12-11
• Runtime: 1h 20min
• Production Company: SHB Productions
• Production Country: United States of America
• Director: Charles Romine