Major changes are on their way, including the end of Prohibition, when Franklin Delano Roosevelt is elected President in the fall of 1932. The Chicago mob, led by Frank Nitti, is out to get control of the upcoming Chicago World's Fair with it's lucrative concessions and other revenue streams. When they are unable to bribe the mayor, Anton J. Cermak, they decide to track his movements and assassinate him. They know he goes to same coffee shop every day at the same time so that becomes the obvious site for the hit. When Eliot Ness learns of the their plans, he races to save the Mayor. In Florida meanwhile, a mentally disturbed man, Giuseppe 'Joe' Zangara, decides to assassinate the President-elect.