This nicely scary little ghost story is pretty straight-forward = in plot. A husband with a sexy mistress is trying to murder his wife, and a protect= ive (family-owned) poltergeist blocks him at every attempt. But the brief summary fails to convey some fine performances and lovely atmospherics t= hat rise above what is basically a "B" - level thriller. The women take act= ing honors -- Sandra Dorne is probably at her most-enticing ripeness as the buxom blonde divorcée who lures David Linton to his doom, and she pani= cs beautifully when trapped with her lover in the doomed house; Patricia Dainton is convincing, too, as the long-suffering wife of the promiscuou= s David. Third, for comic relief, Anita Sharp-Bolster is hilarious as the Irish housekeeper, who complains about "Patrick," whom she's named after her husband "because she never sees him" either! The black and white photography is moody and penetrating, as is the haunting music of John Veale (though it gets too loud and overrides the dialogue once or twice.= ) A hard-to-find video is available from several U.S. sources, both as "Invisible Creature" and "The House in Marsh Road."