Easter Sunday, 1923. Gyp joins his family for dinner, pays a visit to church, and meets with his boss. Richard, with Jimmy's son in tow, goes to Julia's house where her father is again an angry drunk. At the empty bordello, Gillian entertains her substitute for Jimmy. Nucky, Margaret, and the children accept a dinner invitation from Eli, his wife, and brood of eight. Can this go well? Is a rapprochement a possibility?
In the foreground, Nucky makes a play to derail the Attorney General, and Gillian puts a revenge plot in motion. Around the edges, Margaret accompanies Owen to the countryside to look for a pony for Emily and then has a personal conversation with Dr. Mason, Nelson (with his wife's help) finds a new vocation, O'Banion takes his case against Capone to Johnny Torio, and Nucky has to sort things out with the plucky and independent Billie.
Nucky is reeling from a concussion, recovering in a suite at the Ritz Carleton. Nucky wants to enlist partners in a war against Joe Masseria and Gyp Rosetti, but can Nucky hold it together for a meeting with these potential allies - and how will they react? Margaret manages a birthday party for Emily as her affair with Owen takes a serious turn. Richard asks Gillian for a night off from babysitting to meet Julia at a Veterans' Hall dance. Esther Randolph oversees the arrest of George Remus.
Nucky doubles down on his war with Gyp and Joe, sending emissaries to Chicago to enlist Torrio's help and dispatching Owen to murder Joe at a Turkish bath. The bishop disbands Mason and Margaret's classes; Mason suggests they continue the classes at a store front, Margaret says good-bye. Robert faces down Julia's father and then spends a night with her under the boardwalk. Gyp gets a lesson in rogue waves, and a few cases of whiskey wash up on the Jersey shore. Nucky rejects an idea of Chalky's. Back in Chicago, Nelson's wife distills aquavit and Nelson peddles it to ...
A rough 24 hours for Nucky: Margaret and the children are gone, Eddie needs a hospital, and Eli is in Chicago hoping for reinforcements. Nucky turns to Chalky, who still wants a club on Atlantic City's strip. Gyp turns up the heat, stationing his men everywhere and offering $25,000 to anyone in Chalky's neighborhood who gives up Nucky. Will Chalky protect Nucky? And even so, is that enough firepower to face Gyp with Joe Masseria's men? Gillian snoops in Richard's room, and heroin is burning a hole in Luciano's pocket.
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.