In Chicago, Jimmy bonds with one of Johnny Torrio's prostitutes, Pearl, and finds himself increasingly at odds with the hot-headed Al Capone. Back in Atlantic City, Nucky looks to leverage his relationships with ambitious U.S. Senator Walter Edge, as well as Jersey City Mayor Frank Hague. Eli and Chalky go to extremes to interrogate a KKK member; Lucky Luciano sets his sights on Jimmy's "wife"; Margaret impresses at Nucky's lavish birthday party, while Lucy tries to protect her territory.
March 1913. Gwen,one of the maids,has bought a typewriter and has applied for a secretarial post. Most of the staff are dismissive of her aspirations but the family - except Violet of course - are supportive and youngest daughter Sybil offers to supply a reference. Evelyn Napier,considered an eligible catch for Mary, arrives for the hunt,bringing his handsome friend Kemal Pamuk,a Turkish diplomat,who throws himself at her. He goes to her room at night for sex,during which he dies of a heart attack. Mary,Cora and head housemaid Anna return the body to his room and agree to say nothing but are seen by Daisy the kitchen maid. The gruesome twosome of O'Brien and Thomas are also suspicious. Matthew spends a delightful day with Edith,the youngest daughter,whilst Mrs. Hughes literally helps Bates out of a painful situation and they become friendly.
After Peter catches Carter having an affair, he is forced into keeping a secret. But when Peter accidentally spills the beans, Lois' mom demands a divorce, and Peter is in charge of Carter's return to bachelorhood.
Lisa starts coaching Bart's Little League team; Marge and Bart spend the day at an amusement park, where former MLB manager Mike Scioscia gives Bart advice.