A Strange Revolt in The World Of the Future!
One by one, the free nations had fallen, until finally America too was under the heel of the invader. Now the only hope resides in a mountain redoubt where six men work in secret on a plan to rock the planet. . . .
A top secret research facility in the Colorado Rocky Mountains is the last remaining outpost of the United States Army after its defeat by invaders. The conquerors had absorbed the Soviets Union after being attacked by them and had then gone on to absorb India as well. The invaders are depicted as ruthless and cruel. They crush an abortive rebellion by killing 150,000 American civilians as punishment. Noting that the invaders have allowed the free practice of religion, the Americans set up a church of their own in order to build a resistance movement, the Sixth Column. The laboratory is in turmoil as the novel begins, all but six of the personnel have died suddenly, due to unknown forces released by an experiment operating within the newly discovered magneto/electro-gravitic spectra. The surviving scientists soon learn that they can selectively kill people by releasing the internal pressure of their cell membranes, among other things. Using this discovery they construct a race-selective weapon which will kill only the invaders.
Written by Robert A Heinlein (1907-1988)
Was published under the title Sixth Column, and was based on a story by editor John Campbell and published in serial form from January 1941 thru March 1941, under Heinlein's pen name Anson MacDonald.