A top secret research facility hidden in the Colorado mountains is the last remaining outpost of the United States Army after its defeat by the PanAsians. The conquerors had absorbed the Soviets after being attacked by them and had then gone on to absorb India as well. The invaders are ruthless and cruel. As an example, 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 better to pacify their slaves), the Americans set up their own church in order to build a resistance movement – a "sixth column", as opposed to a traitorous fifth column.