Nucky smuggles in a dozen "Tommy guns" into Ireland in his father's casket as a gift for the Irish rebellion. However, he hopes to exchange the 3.000 remaining guns at home for some Irish whiskey. Mr. McGarrigle refuses his offer, choosing peace with the English over continued war. His decision doesn't sit well with other members of the rebellion and he is executed. Nucky is now in business with Bill who accepts the trade of guns for booze.
Meanwhile, Margaret's daughter Emily wakes up unable to move her legs. The doctor quarantines Emily and discovers she has polio. Margaret burns her daughters things to eliminate the risk of contaminating others. Her distress at being separated from her daughter is so great that she sneaks into the quarantine ward to hold her sick child.
Jimmy decides to deal with Horvitz by telling his enemy, Waxey Gordon, that Horvitz has killed two of Waxey's men. Waxey sends an assassin to kill Horvitz, but the attempt fails and Horvitz finds a matchbox from Atlantic City in his would-be-killer's pocket.
Dunn Purnsely is fed up with working conditions for black people in Atlantic City and incites a worker's strike among the kitchen help.