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Throughout the years Hollis has observed them among his dreams, watching from a distance as they foraged under a blackened sky. After a time he understood that they, like him, had sensed the flux of earth, yet were undaunted: having journeyed perhaps twenty miles in almost fifty days, a procession of cows-nomadic Herefords and Jerseys-grazed onward, wobbling over a moonlit prairie, bulky heads lowered; their hooves crunched sandstone and pumice, and their excreta, hardening behind them, marked the slender trail in uneven circles-testaments to how far they had come, symbols of presence, like the burned-out and rusting wheelless cars they encountered within unkempt pastures of bluebonnets and high brittle grass, or the gutted houses abandoned on good soil (porches collapsing, doors gone, the wind sneaking through busted panes into dim interiors), or any number of fading signposts passed along the way, those many things fashioned by man-made design and then left again and again as the herd proceeded, weaving blindly ahead for no other reason than it must.

And there, too, he has infrequently witnessed the approach of other languid creatures: half-naked human figures emerging whenever the recurring cows failed to manifest, hundreds of pale bodies cutting through the landscape, angling across the same nighttime terrain but traveling in the opposite direction. That serpentine formation of listless souls wound back into the darkness-the shapes of children, men and women, mothers cradling infants, the elderly-coming from where the cows had been headed, drawing nearer while never quite reaching him. But it was the gas mask each one wore which disturbed him the most-such cumbersome equipment obscuring their fa...