"21" is the first episode of the second season of the HBO television series Boardwalk Empire, which originally aired September 25, 2011.

Nucky deduces that Jimmy is in league with the Commodore, and subtly warns him to carefully consider his position.

Nelson Van Alden's wife Rose visits for the weekend and is dismayed by the depravity of the city.

While Margaret Schroeder takes her children to see The Kid, Nucky is arrested for election fraud.

They continued by praising the "masterfully shot" speech Nucky gives to two different sides of the racial conflict.