Nucky takes inventory after being warned of a skunk in his cellar. On the lam following a close call, Chalky and Daughter take refuge outside Wilmington with Oscar Boneau, his mentor from years ago. Gillian considers selling her mansion and starting a new life with Roy Phillips.

Nucky refuses to back Chalky in a conflict; Gillian makes her custody case in court; Van Alden stands up to Capone and comes clean to O'Banion; Rothstein tries to make a trade.

Chalky heads in a new direction; Margaret finds herself in a quandary; Nucky hosts a prospective partner from Boston; Luciano and Siegel meet with Narcisse in Harlem; in 1884, young Nucky flirts with a girl.

Nucky heads to Tampa to work out details of his land deal with Bill McCoy; Richard Harrow returns to Atlantic City; Agent Knox tries to gain Eli's trust; Chalky takes out his frustrations on Daughter Maitland.

Eli confronts Nucky after Willie makes an unpopular decision. Margaret has a surprise encounter at her job on Wall Street. Joe Masseria orders Lucky Luciano to return to Tampa and deal with Vincenzo Petrucelli. Gillian goes cold turkey, with Roy Phillips’ help. Still seething over his brother’s death, Al Capone tries to get Johnny Torrio to turn on rival gangster Dean O’Banion. As Chalky White and Daughter Maitland’s relationship deepens, Valentin Narcisse exerts his control over Dunn Purnsley and the Northside.

Nucky pays a visit to Johnny Torrio; Eli and Van Alden must recoup money lost during a federal raid by Eliot Ness; Willie has a job interview; in 1884, young Nucky deals with the death of his sister.

Chalky returns to Atlantic City; Nucky arranges a meeting with Maranzano; Eli reunites with June.

Nucky and Margaret find common ground in Atlantic City; Luciano encounters an old adversary; Sally Wheet makes a payment in Cuba; in 1884, young Nucky moves up the Commodore's ladder.

During Mayor Bader's birthday party, Nucky's attorney comes up with a solution that might help Nucky in his election-rigging case. With a liquor surplus likely, Jimmy and Mickey travel to Philadelphia to search for buyers while Nucky makes a surprising deal to try and get alcohol into Atlantic City. Eli is concerned over the Commodore's ability to lead. Margaret decides to give her staff bonuses. Chalky is cornered while at work and home. Owen takes his munitions expertise and uses it. Van Alden's agents set their eyes on Mickey's warehouse. Richard lets his guard down in the name of art. And Gillian thinks of the first time she was ever with the Commodore.

Nucky tries to set up a risky liquor delivery to Philadelphia. Later, Attorney General Daugherty sees a problem that might complicate Nucky's case. Jimmy finds a new mentor in Leander Whitlock who is the Commodore's lawyer. Margaret finally goes to confessional. Lucy continues to struggle with loneliness while Van Alden tries to settle his conscience.

Nucky tries to hold onto his assets in Atlantic City; Willie and Eli become involved in Nucky's war.

Nucky is shocked by an insurrection among his inner circle. An attack threatens Chalky's life and livelihood. Margaret deals with her son's problems. Angela vies for Jimmy's affection. Van Alden shows his wife around town.

The Commodore throws his weight around with the Coast Guard to disrupt the delivery of alcohol, which creates an opportunity for Owen to demonstrate his value to Nucky and a struggling casino. Meanwhile, a letter dredges up painful memories for Margaret, Nucky calls in a favor with the U.S. attorney general, Meyer and Lucky learn the price of power, and Lucy searches for ways to cure her loneliness.

After a dispute with his enemies, Nucky brings in a surprise guest speaker at a Memorial Day dedication for war veterans. Running out of options, Eli questions his allegiances, but it ends up sending him deeper into the hole. Nucky hires a new lawyer. Jimmy is taught a lesson by one of the Commodore's men that he won't soon forget. Richard decides to go hunting in the forest.

Margaret has a family reunion. Owen gets even with a rival. Van Alden recognizes the hierarchy of the law. Jimmy wonders how a decision will affect the future.

Nucky is detained in Washington; Margaret copes with Teddy's demons; Owen investigates a suspicious fire; Richard makes a connection with a veteran and his daughter.

Federal agents enlist the help of Eli and Van Alden to take down the Capone organization.

Following his battle with Gyp Rosetti, Nucky makes a peace offering to Joe Masseria while working the odds with Arnold Rothstein. While Chalky is busy running the Onyx Club on the Boardwalk, the impulsive Dunn Purnsley clashes with a booking agent. Fresh-faced Federal Agent Warren Knox arrives in Atlantic City to learn the ropes from Agent Sawicki. Gillian seeks custody of her grandson, Tommy, while trying to find a “good” man to keep the Artemis Club afloat. Eli’s college-age son, Willie, turns to Nucky for career advice. Al Capone enlists his brothers, Frank and Ralph, to help him expand his business in the Chicago suburb of Cicero. Richard Harrow returns to his violent ways.

Nucky enlists Eli and Agent Knox to check the cargo in the Florida shipments; Margaret considers making a deal with Rothstein; Capone grows suspicious of Torrio; Nucky faces a dilemma.

Nucky deals with the fallout from Jimmy's rogue heist, sending Eli to sow the seeds of doubt in the mind of Margaret, who seeks help in the wake of her husband's demise.

Arriving in Belfast, Nucky and Owen meet with IRA leaders with a barter proposition. Meanwhile, in Atlantic City, Jimmy and his partners broker a deal with George Remus for his “medicinal” alcohol before taking a break to see/hear the Dempsey fight. Margaret frets when Emily’s illness takes a turn for the worse. Dunn Purnsley orchestrates a worker’s strike at the Ritz. Waxey Gordon takes action against Manny Horvitz in Philadelphia, and Randolph and Clifford Lathrop grill Halloran about Nucky’s past.

Undercut by Nucky, who has a new source for alcohol, Jimmy and his partners look to cultivate a new revenue stream in Atlantic City. With the peak tourist season approaching, the Commodore’s crew faces a choice in dealing with the city’s striking workers; either negotiate or fight back. Fearing that sin has led to misfortune, Margaret approaches Father Brennan with an “act of devotion.” Nucky gets a new lawyer. Van Alden faces an uncertain future. Manny Horvitz takes exception to a debt payment.

Nucky gets to know Arnold Rothstein over a card game, and sizes up an unexpected partner for his Tampa land deal. A newly promoted Eddie Kessler gets detoured after making a train-station delivery. When one of their collectors is incapacitated, Al and Frank Capone decide to finish his route, enlisting a reluctant Van Alden to tag along. Agent Knox fills Hoover in on the Thompson operation, vowing to exploit Nucky's weakest link. Chalky is intrigued by Daughter Maitland’s presence. Dunn Purnsley goes to Harlem, and is courted by Valentin Narcisse. Willie and his college roommate, Clayton, carry a practical joke too far.

Nucky’s shipment from Florida arrives with some unexpected cargo. Eli is backed into a corner after Agent Knox uncovers some new dirt on the Thompsons. After talking things over with Nucky, Willie reconsiders his recent life choices. Chalky throws down the gauntlet toward Valentin Narcisse, upholding his leadership on the Northside.

In the wake of a personal loss, Nucky solicits advice on his political situation from Arnold Rothstein, while Eli remains suspicious of his brother’s actions. Nucky finds himself in the unfamiliar position of showing gratitude toward a federal agent. Angela meets a new friend at the beach, and eavesdrops on her husband’s treachery. Nelson gets a nanny. Nucky approaches Owen with an overseas proposition. Jimmy flexes his muscles, at Mickey Doyle’s expense.