Lisa makes a new friend at school - Harper, who happens to be super-rich, while Homer makes friends with Harper's dad and sets out to continue living the good life when Lisa decides to end the friendship.
When Homer loses his job due to Marge's social media post, he begins working as a dishwasher at a Greek restaurant. Meanwhile, Lisa creates an app that can predict the effect any post on social media will have.
Lisa tries to launch the career of a homeless Appalachian folk singer, but Bart warns her that she will just let her down. Meanwhile, Homer tries to rescue the cat, who is trapped in the walls of the house.
After Lisa overhears Marge say that she doesn't like Lisa's jazz music, Marge takes Lisa on a trip to Capitol City to regain her friendship. Meanwhile, Bart uses Maggie as his new partner in crime for his practical jokes.