The year is 1937. The United States has shattered under the weight of the Great Depression, regional Prohibition, and mounting isolationism. The transcontinental railroad and the budding highway system have become useless as they now cross hostile borders. Commerce and trade leave the ground as air travel—once a national obsession—now becomes a vital lifeline connecting allied countries. Giant zeppelins crisscross the skies, carrying both passengers and cargo. It is a time of gunship diplomacy and airship piracy. It is the age of the fighter pilot and a time of daredevil adventure and sinister intrigue. It is the world of Crimson Skies!