Boardwalk Empire, The Age of Reason

Nucky is rocked by an insurrection among his inner circle, and Chalky's life and livelihood are threatened by a KKK attack.

Nucky deliberates a countermove while trying to learn who betrayed him. Margaret strikes a pose from the past to help Nucky avoid further trouble in the present. Jimmy weighs an alliance with Meyer Lansky and Lucky Luciano in New York.

Nucky calls in a favour as tensions with the Commodore escalate. Owen intervenes on a delivery intended for struggling casino operator Lolly Steinman, proving his worth. Lucy chafes at her loneliness.

Nucky's attorney might turn the tide in Nucky's election-rigging case. Jimmy and Mickey visit Philadelphia in search of buyers for their liquor surplus while Nucky strikes a deal to get booze into Atlantic City. Eli doubts the Commodore's ability to lead.

A desperate Eli questions his allegiances. Jimmy learns a lesson as Richard goes hunting.

Nucky orchestrates a risky liquor delivery and faces complications in his federal case. Jimmy finds a new mentor, and Margaret makes a confession.

Nucky hires Jack Dempsey to promote his fight, and Jimmy faces a decision that could shape the future of Atlantic City. Margaret visits Brooklyn for a bittersweet family reunion. Nelson weighs his options, and Lucy visits an old flame for a handout.

Nucky solicits advice on his political situation from Arnold Rothstein, while Eli remains suspicious of his brother's actions. Angela meets a new friend at the beach and eavesdrops on her husband's treachery.

Arriving in Belfast, Nucky and Owen meet with IRA leaders with a barter proposition. Meanwhile, in Atlantic City, Jimmy partners with George Remus to sell his medicinal alcohol. Margaret frets when Emily's illness takes a turn for the worse.

Nucky undercuts Jimmy's bootlegging initiative as tensions escalate among striking workers and employers on the boardwalk. Margaret approaches Father Brennan fearing that sin has led to misfortune.

With Margaret pondering the consequences of sin, Nucky prepares her for a worst-case scenario as Esther Randolph plays out her trump cards. Jimmy revisits his college days with Angela and Gillian.

With Nucky's trial looming, Jimmy looks to make amends. After weighing an offer from Esther Randolph, Margaret decides to change the course of her future -- and Nucky's.