Sorry, we have not watched this yet.
In 1880s London, Mr. Markheim stabs to death a pawnbroker whose wealth he has long envied. Markheim says he intends take some of the businessman's riches, marry, and become a saintly man. An otherworldly visitor who knows Markheim intimately informs him that he will never change his evil ways and therefore should kill again.
Sorry, we have not watched this yet.