Stan Sherman

David and Jane, a happily married couple, are abducted by a secret sex cult led by Persephone who subjects them to the most horrific sexual torture they have ever imagined.

An old acquaintance of newlyweds shows up at their doorstep. They seem glad to see her, but what they don't know is that new guest harbors a deep grudge against them for something that happened years before, and is plotting her revenge.