Fanatic (1965) (UK-import)
Classic British horror starring Tallulah Bankhead as the fanatically religious Mrs Trefoile, a psychotic woman who, with the help of her gardener, Joseph (Donald Sutherland), imprisons her dead son's fiancée, Patricia (Stefanie Powers), in a tiny room in her home so that the girl's soul will be properly cleansed in order to be reunited with her late partner in heaven.