This movie was a thriller, and old mansion was inherited by a couple. There was a lighthouse in the movie. A crazy sister was found chained in an attic. Oliver Reed was a bad guy in this movie.

Here is a list of Oliver Reed movies:

Oliver Reed (I) (http://www.imdb.com/name/nm0001657/)

When you have the time look for it.

Sarah

The Shuttered Room (1967) (http://www.imdb.com/title/tt0062266/)