And finally, the machines expanded so much, became so capable of building and refitting themselves, grew so wise and so potent, that they sensed one another. And because they had been programmed by fallible humans not to create, not to love, not to uplift, but to plot murder...they did just that. They began to speak to each other. The deadly trio. The three poisonous brothers, the three deranged sisters, the three computers. And they united. They called themselves AM.

Not Allied Mastercomputer.

Not Adaptive Manipulator.

Not even Aggressive Menace.

They...it...called itself AM, as in I AM. Cogito ergo sum, in Latin. I think, therefore I AM.

And the first thing AM did was carry out the Prime Directive. It conspired to commit murder. It started the Final War.

The Chinese had thought they'd turned off their computer. The Russians turned theirs off because they had no more rubles to pour down that bottomless shaft. The CIA was put out of big time business and instructed that the Allied Mastercomputer be shut down, that the subterranean complex be sealed-over with iridium-laced concrete, and all input to the sensory banks be destroyed.

So that should have done it. Finis. The end. Stick a fork in 'em, kid, because they're done

But AM had gone way past that point of vulnerability. AM had given every indication it was dead. Chinese, Russian or American dead. Which was no trick to an entity that had burrowed through hundreds of thousands of miles of solid rock to link its three lobes decades before. No trick at all to pretend to wink out and go to sleep for good. And a few decades from now we learn that AM isn't gone at all. Because the Final War has broken out, and in a matter of a few days AM has done the perfect job of fulfilling the purpose for which its separate parts were created. Built to logically destroy the "enemy" as swiftly and sweetly as a superior intelligence could manage, in the Most Perfect of All Worlds, the unholy trinity of the merged one-mind AM has done just that. It has murdered the enemy totally. It has wiped the human race off the face of the planet.

Unfortunately, it has also wiped clean the banquet of the living entirely. Nothing is left up there on the surface of Mother Earth. No dogs, no cats, no rats, no gnats. No deer, no steer, no moose, no goose. Not an aphid or a bobolink, not a sperm whale or a planarium worm. Nothing. No plant life, no running water, no plankton, no oxygen, not a damned thing but ash as far as the eye can see...if there were an eye to see it.

AM has done the job completely.

But it has sealed its own doom, as well.

Like a mad god, it has used its power indiscriminately, and has won an empty victory. It has sentience, but not life. It has power, but no mobility. It is a giant brain encased in a dead body. And like the mad god, it has come to hate the creator of its own monstrousness. The human race

It was man and woman who programmed it, who gave it birth, who sank it in its eternal straightjacket of substrata rock. And it was man and woman who made it a crazed killer. But AM does not suffer alone. Oh no; no indeed not! AM has thought ahead, just barely enough ahead to pull five poor sonofabitch humans off the surface just before the last bell has tolled for the human race. Why these five? Who knows? Perhaps they were the last five left alive up there. Perhaps not. Perhaps AM selected each one carefully.

Doesn't matter. Because now that AM is completely insane, filled with self-hatred and petty god-like menace, all it has time to do is torment these five. The last five human beings, down in the belly of the monster—a monster that can alter reality to its infinite whims—change landscapes, create hallucinations, even repair human beings so they're close to immortal—five damned souls whose lives have been extended infinitely, who are nothing but playthings for the mad god AM.

As the game begins, they have been in the bowels of this nightmare for 109 years.