When a house in the neighborhood is put up for sale, Archie starts a petition to keep ethnic groups out. Henry Jefferson joins the effort when a Hispanic couple show interest. All this happens during a stifling heat wave in New York City.
Louise is planning a farewell party for Henry who is moving away to start his own business. The problem is that she can't get George to attend because he won't set foot in a white man's house. So, through a mangle of miscommunication, she manages to get Edith to agree to host the party at her house. Of course, during the party Archie has to give his full opinion of the proceedings and of Henry's new venture. George reluctantly arrives to give his brother a farewell toast.
Archie learns that the mentally disabled have some real abilities, not to mention savvy, when he causes Gloria's friend, a stock boy at Ferguson's Market, to lose his job. The young man then finds himself another job.
Archie learns that the canned mushrooms he just ate may have been part of a product recall because of reports of food poisoning. Mike urges Archie to investigate, but Archie decides he's sick and needs hospital treatment.