Peter Colley

A couple live in an old, isolated mansion. The husband's murderous, insane twin escapes from a lunatic asylum. The cops haul off the wrong twin and the wife is stuck with the killer. (imdb)

After she has a nervous breakdown, a wife and her husband move into a new house. However, she begins to suspect that that her husband and his sister, who is visiting, are up to something and may have had something to do with her breakdown. (imdb)