If You Want the Rainbow (You Must Have the Rain)
performed by Nora Jones; features Vince Giordano and the Nighthawks

With his holdings in Atlantic City lost, Nucky decides to go for a swim in the ocean. Meanwhile, in New York, due to Nucky's manipulation of Mayflower stock, Kennedy's business associates are nervous that repeal will not happen, and begin unloading their shares. Kennedy suspects Nucky's involvement, but Margaret convinces him to short sell his own shares. Margaret meets Nucky to inform him of her success, and it appears that they will rekindle their relationship but are interrupted. Nucky later returns to Atlantic City, intending to leave the city forever. He goes and meets Eli, gives him some money, and encourages him to return to his family. He then meets Gillian in the sanitarium, telling her the most he can do is set up a trust fund for her when she is released. However, it's revealed that Gillian has already been forcibly sterilized. Back in New York, Luciano and Lansky gather crime bosses from New York and all around the country and form the Commission, a singular body will mediate relations between all crime organizations in the country. Luciano also tasks Bugsy with killing Narcisse, and he is publicly assassinated in front of his church. In Chicago, Capone is served a court summons when the authorities manage to obtain his ledgers. While he publicly boasts that the charges of tax evasion won't stick, Capone says goodbye to his son before heading to court, where D'Angelo is waiting for him. Back in the past, Deputy Nucky finds out Mabel has miscarried, much to his shock. He is then summoned to his family home, where he physically beats his father for hitting his mother again, and warns there will be consequences if harm were to come to his mother again. After returning to Atlantic city, Nucky comes across Gillian again, who is participating in a parade. The Commodore promotes Nucky to Sheriff, and his first task is to deliver Gillian to him. Nucky reluctantly approaches Gillian, telling her that the Commodore is willing to take her in, and promising that he will look out for her. Back in the present, Nucky comes across Joe Harper again. Harper reveals that his real name is Tommy Darmody, Jimmy's son and Gillian's grandson, and shoots Nucky three times before being restrained by the police. As Nucky dies, he sees a vision of a younger version of himself swimming in the ocean and catching a coin.