Wealthy gentleman is mourning the loss of his wife. Since the wealthy gentleman is played by Stewart Granger, it's a safe bet wife was murdered. Scullery maid Jean Simmons knows that, too, and is out for blackmail. Granger won't stand for that, but makes a fatal mistake in the fog.
Decent enough Victorian murder drama would be much better if there was tighter direction and some sort of character development.All the players are just cardboard cutouts playing a game of Clue. Travers, especially, is wasted as the suspicious solicitor friend. Simmons and Granger rise above the material, and Lee is as lovely and underrated as ever, though her character is utterly stupid. Nice twist ending, that almost makes up for the routineness of the rest of the film.