Season Five Premiere. Nucky recalls his A.C. roots. In 1931 Cuba, Nucky forges ties with Bacardi Rum with the hope of Prohibition's repeal in the U.S. Margaret finds herself in the hot seat when her boss, facing an internal investigation, decides his own future. In New York, Lucky Luciano sets in motion a bold plan--a move that reverberates with Nucky all the way in Cuba.
Back from Cuba after a dangerous encounter, Nucky pays a visit to a 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 to recoup money lost during a federal raid by Eliot Ness. Nucky dines with Tonino Sandrelli before sending a message to Lansky and Luciano.
Chalky heads in a new direction after assessing his latest partnership. In New York, Margaret finds herself in a quandary. Nucky hosts a prospective 'big fish' partner from Boston. Luciano and Siegel meet with Narcisse in Harlem, promising business as usual but encountering resistance. In 1884, young Nucky is privy to the passion of a hotel guest.
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 Eli how the other half lives, and takes another step up the Commodore's ladder.
Chalky returns to Atlantic City with vengeance on his mind. Concerned about the ongoing threat from Luciano, Nucky arranges a meeting with Maranzano in New York. In Chicago, Eli's reunion with June takes an unexpected turn. Capone looks to relocate his operation out of Chicago; Margaret completes a deal with Carolyn Rothstein; Nucky gets bad news from Cuba.
In Harlem, Chalky encounters Narcisse in hopes of setting Daughter Maitland free. Federal Agents enlist Eli and Van Alden to help take down the Capone Organization. Pained by a recent loss, Nucky turns to the bottle, and the company of a pair of barflies. In 1897, a young Nucky vents his frustration to Mabel after endorsing Jim Neary, and roots out a thief with Eli's help.
Nucky, at war with Luciano, looks to hold onto his assets in Atlantic City. Willie and Eli become involved in Nucky's war. Maranzano meets his fate. Nucky reads Gillian's letter from the hospital. In 1897, Mabel and Nucky argue about a young runaway from Trenton, while Nucky does a discreet favor for the Commodore.
Series Finale. After a shakeup, Nucky looks to relocate to Manhattan from Atlantic City. Margaret impresses Nucky; Luciano tends to unfinished business while establishing a mob commission; Capone grapples with tax-evasion charges; Nucky visits Gillian at the hospital. In 1897, Nucky copes with a family crisis while making a deal with the Commodore that will settle his future.