One of the easiest and relatively interesting short stories is "Lamb to the Slaughter" by Roald Dahl. The short story explores a woman who murders her husband with a frozen leg of lamb, then proceeds to cover up her murder. One of the thematic topics you can connect to is Evil, and, more specifically, the idea of Evil in women. This will allow you to relate to Lady Macbeth in the play, which could be an interesting comparison between the two. How each talks herself into and through a murder; how each covers up their respective murders; the weaknesses and strengths each exhibits; the idea of guilt you can explain and describe in each; along with the notion wickedness in each woman.
I've attached links to both at the bottom for you to look into.