It is 1924: a time of rebuilding both in America and in the devastated cities of Europe and Canada. In the United States, the Socialist Party battles Calvin Coolidge to hold on to power. And it seems as if the Socialists can do no wrong as the stock market soars and America enjoys a prosperity unknown for half a century. But as old names like Custer and Roosevelt fade into history a new generation faces new uncertainties.
The Confederate States, tasting defeat in the Great War, suffer poverty and natural disaster. The Freedom Party promises new strength and pride - and may prove a dangerous enemy for the hated USA. Yet the United States take little note, basking in their shared world domination with Germany.
In a world of occupiers and the occupied, of simmering hatreds, shattered lives and pent-up violence, the centre can no longer hold. And for a powerful nation, the ultimate shock will come when a fleet of foreign aircraft rains death and destruction on one of the great cities of the United States.