John Thomas Rourke's remarkable survival skills enabled him to emerge unscathed from the nuclear devastation of W.W. III. But terrifying new storm clouds loom over the eastern horizon as the ex-CIA Covert Operations Officer and weapons expert takes command of his battered nation's broadening air and land war against the brutal Soviet foe. Russian troops, utilizing a blood-curdling new Particle Beam technology, have launched a furious assault on the Eden Project. Joining forces with his international allies including the army of the underwater citadel Mid-Wake - Rourke races to the defense of the beleaguered settlement. The entire world is dividing to do battle a fourth time. But this time the Earth's atmospheric envelope is so fragile that a single nuclear bomb blast will assure the total annihilation of mankind. And unless John Thomas Rourke can stem the raging Communist death-tide before the ultimate button is pushed, no power on the planet will be able to forestall humanity's extinction - not even The Survivalist.