Back from Cuba after a dangerous encounter, Nucky pays a visit to the now retired Johnny Torrio, who agrees to broker a meeting with the new "Boss of Bosses," Salvatore Maranzano. In Chicago, Eli and Van Alden are tasked by Mike D'Angelo, Al Capone's new right hand man, to recoup money lost during a federal raid by Eliot Ness. Fresh out of law school, Willie Thompson has a job interview. Rebuffed by a group of would be financiers, Nucky dines with Tonino Sandrelli before sending a message to Lansky and Luciano. In 1884, a young Nucky deals with the death of his sister, Susan, while his father has a standoff with the Commodore.

Facing a shared dilemma, Nucky and Margaret find common ground in Atlantic City. Luciano encounters an old adversary while meeting with Capone in Chicago. Sally Wheet makes a payment in Cuba amidst concerns of a grass roots uprising. In 1884, young Nucky shows young Eli how the other half lives, and takes another step up the Commodore's ladder.