One by one, the Free Nations had fallen. America stands alone against the World. Now, through scattered resistance flares throughout our continent, the only real hope resides in a mountain redoubt where six men work in secret on a plan to rock the planet ...

Originally written in 1940 as a serial for Astounding Science-Fiction. Reprinted in 1948 by Gnome Press with additional material, and reprinted later under the title The day after tomorrow.