Let's Scare Jessica to Death Movie poster

That evening at dinner, it's obvious even to Woody that Duncan and Emily have eyes for each other. When Jessica retires early, Woody tells Duncan to take care of his wife. Reluctantly, Duncan goes up to their bedroom. Instead of taking care of his wife, however, he tells Jessica that she needs to return to New York to see her doctor again. Jessica becomes upset and tells Duncan that she wants to sleep apart tonight, so Duncan goes down to sleep on the couch where he is easily seduced by Emily.
The next morning, Jessica finds the little mole has been repeatedly stabbed to death. Jessica denies doing it, but Duncan decides that it's time to get help for her and drives into town in search of a phone. While he's gone, Jessica goes up to the attic where she is surprised to come face to face with the silver-framed portrait of the Bishop family that they had sold just yesterday to Sam Dorker. When she takes a look at the three figures in the portait, she is astounded to see how closely Abigail Bishop resembles Emily. Is it possible they are one and the same?