In the summer of 1929, Weimar Germany's secret military agreement in the 1920s with the USSR to evade the Versailles Treaty and develop new weapon systems beyond the Ural Mountains is about to bear fruit. Aided by a shadowy international conspiracy of arms dealers, industrialists, and financiers, both countries are poised to dismember the newly independent Poland created in the aftermath of the Great War. To distract Britain from helping the Poles and risking a new world war, the conspiracy intends to foment a coup d'etat in the Irish Free State.
By the spring of 1931, a conspiracy is underway in Germany to assassinate President Hindenburg and restore the Kaiser's son to the throne, threatening the peace of Europe. At the behest of her godfather, Winston Churchill, the adventurous journalist Mattie McGary, a rising star in William Randolph Hearst's press empire, and her lover, Bourke Cockran, Jr., a New York law school professor and former army counterintelligence agent, get involved.