Nucky makes a resolution; Margaret considers a hospital expansion; Gillian builds a new business; Van Alden stumbles onto a confrontation.

Nucky mixes business with pleasure in New York; Margaret's altruism is met with resistance; Gyp tries to establish a strategic foothold; Chalky and his daughter disagree about her future, Eli gets a new boss.

Nucky reluctantly joins Margaret to receive a high honor from the church. Gyp makes a one-time deal with Nucky. Van Alden regrets trying to socialize. Margaret pitches her women's clinic. Lucky and Meyer protect their investments.

Nucky and Owen hide out. Mickey makes a critical decision in Nucky's absence. Tensions rise in the feud between Capone and O'Banion.

Rothstein vents to Nucky and delivers a message to Gyp. Gaston Means sees an opportunity. Billie gets a new co-start. Van Alden and Sigrid receive an unexpected visitor. Gillian worries about her business.

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.

Eli hopes to get back in Nucky's good graces. Gillian tries to improve her future. Gyp asks for a blessing in New York.

Gillian makes her peace with Jimmy's death. Van Alden attends a meeting with Capone and Torrio. Nucky makes an offer to Andrew Mellon. Margaret makes a stand on birth control. Nucky and Owen shop for a pony. Billie considers a future in film.

Nucky vows to eliminate his nemesis. A high-profile bootlegger is arrested. Emily's birthday party is scaled down. Gillian blames Harrow for Tommy's trouble. Gyp decides to buy a town's silence.

Nucky tries to keep Jess Smith quiet and neutralize Gyp's alliance with Joe Masseria. Margaret considers an alternate future. Van Alden's side business backfires. Gyp's shipment is short. Chalky sees an opportunity.

Gyp makes his move in Atlantic City, forcing Nucky and Eddie to seek refuge with Chalky. With the Artemis Club overrun by Rosetti thugs, Gillian contemplates a business future that includes an unwelcome partner. Luciano makes a deal he’ll come to regret. Harrow loses his house privileges.

A gang war erupts in Atlantic City, with Gyp and nine men of his own and 40 of Joe Masseria's against Nucky, Eli, Capone's Chicago crew, and Chalky's men. Gyp's holed up at Gillian's; Nucky at a lumber yard. It's a war of attrition, with Nucky having to keep Capone and Chalky's men from killing each other while he negotiates with Rothstein by phone. Rothstein runs his own game with Luciano, Lansky, and heroin, Margaret calls on an older couple, and Richard is out there somewhere focused on protecting Tommy.