The Mortar Yields

For three days the water had stagnated in the pewter mug, with two dry mint leaves rotting on the surface. On the greenish rim of the metal there still lingered the dull mark of a thumb that no longer had a name.

Eusebio's sole scrapes lazily against the basalt of the landing, a dry and listless brush, as if out there the man were measuring wakefulness in millimeters of worn leather. Neither of them moves inside the room. Darío keeps his weight loaded on his right heel to avoid resting the whole sole on the joint where the rock exhales its warm vapor; it burns, a dull and persistent burn that climbs slowly up the tendon, while his left instep remains livid beneath the freezing draft slipping through the open loophole. Stone lives in that discord—one side bakes the flesh, the other numbs it to the point of gangrene—and between those two extremes there is no room for any pact. Tarsio remains standing beside the ragged pallet, his rough flannel shirt open at the chest, breathing not like one who is about to land a blow, but like one waiting for the final snap of a copper wire that has been stretching too far for weeks.

The three-finger crack in the door lets through a strip of sickly light, barely fed by the mutton-fat lamp hanging from the lintel. There is no bolt. There never was a bolt, because the shared silence between two men who despise each other is only lawful if a third party can testify that air is still entering both their lungs. Darío scratches a dried scab on his knuckle with his thumb.

Tarsio picks up the vial with two fingers. He pries off the wax stopper with his nail, brings it to his nose and pulls it away at once, like a man smelling soured milk.

"Henbane," he says. "The kind the infirmary keeps for those who won't live to see spring."

Darío does not answer. If he says a name, the boy from the mill wakes up hanging from the rafter; if he doesn't, the one hanging will be him.

Tarsio stoppers the vial again and tucks it into his waistcoat, next to the safe-conduct Darío would not take. He asks nothing. That is the worst of it: that he does not ask.

"You have soot on your eyebrow," Tarsio says.

Darío does not look up.

"And you on your tongue."

An exchange that buys nothing. Nothingness, lime, fatigue. The words fall onto the damp esparto mat like screws tossed into a mud pit. How long does it take a man to forget the flavor of an apple that hasn't been rubbed with brine to rid it of cellar mold? Darío swallows; his throat is a narrow conduit lined with fine sandpaper, and his molars grind against an invisible grit that never quite detaches from his gums. The five o'clock fever has not entirely died out: it still throbs behind his temples, warm and dense, staining the roots of his teeth with that ochre sediment no bristle brush can ever scour away.

The hiss of the boilers beneath the floor, which for hours was only a background drone like the passage of a cart convoy through a distant marsh, shifts its tone. First it is a vibration in the toenails; then, a metallic, high-pitched complaint, as if a massive nail were being ripped from an iron beam with a blunt pair of pincers.

It stops.

The silence that follows has nothing peaceful about it: it is the pause in the air before a wave crashes against a salt-eaten pier. Tarsio takes a half step toward the doorway, his right knee creaking with the harshness of an old hinge. In the gloom, his eyes look like two bottomless gray slits, accustomed to not blinking so that the tallow smoke will not irritate them.

The smell of sulfur grows thick as pitch when the basement purge vents drop with the crash of scrap metal.

The uproar shakes the courses of basalt. It is not an earthquake, but the mechanical collapse of a throat that can no longer hold back the boil: a dull thud, of iron plates thrashing against the cobbled floor, followed by a snort that rips the dry mortar from the seams between ashlar and ashlar. A hot, white cloud, smelling of rotten eggs and scorched animal fat, erupts from the baseboard joints, swelling the air like a deranged bellows. The mortar crumbles into small chunks that rebound against Darío's calves. Grayish dust. Ash that does not burn but suffocates, settling on his eyelashes like dirty snow.

Darío leans against the wall to keep his balance; the wall is so hot he jerks his fingers away, leaving behind on the basalt a patina of sweat and haze that evaporates instantly. Down there, in the blind galleries of the combustion pits, three hundred people are breathing that same unvented cloud with no barrier to separate them from the blind steam.

"Boilers three and five," Tarsio murmurs, his voice, for the first time all night, losing its veneer of insolence to sound like a rusted sheet of metal vibrating in the wind. "The relief valve has gone."

"If they don't open the draft dampers, the pitch from the pits is going to spill into the trenches," Darío says, interrupting himself because the hot air bites his throat like a handful of needles. "It's going to drown them all."

"Nobody opens a damper at this hour. You know how this works."

Silence.

When the stone breaks, it does not look for the guilty: it crushes whatever lies beneath. Darío knows this. He has known it since he saw the first hair-thin cracks trace themselves across the lintels of the lower kitchen three moons ago, while the servant boys carried baskets of fine coal with wrists ulcerated by brine. The collapse never warns with fanfare; it always begins with a fine grit falling silently into a bowl of soup, until the keystone yields and the mountain reclaims its original weight upon the ribs of the living.

"Eusebio," Tarsio calls toward the crack, without raising his tone, with that economy of saliva characteristic of men who have seen too many mineral deposits burn.

The warden does not answer with a voice, but with his boot. The wood of the door gives two palms under the shove of his knotted shoulder, revealing the outer corridor, where the sulfurous vapor already forms a milky fog that blots out the base of the steps. In Tarsio's right hand appears—without Darío ever managing to distinguish from what corner of the planking he snatched it—a narrow, notched blade, stripped of its scabbard, the metal stained with brown streaks of old rust.

"No one goes down to the pit without iron," Tarsio says, looking at Darío's collarbone, not his eyes (he always looks at the spot where the blow would be decisive). "And you're going first."

"I don't have boots."

"Walk on your toenails if it pleases you."

The low boiler corridor is not a hallway: it is the intestine of a beast that has spent three centuries digesting rubble and stagnant water. The walls ooze a viscous sludge that smells of fresh rust and rat urine; the lead pipes stapled to the vault drip a scalding condensation that stings naked shoulders like forge sparks.

Darío walks barefoot. Every step on the damp basalt is a miserly calculation: avoiding the slabs that vibrate with the subterranean transit of the steam so as not to scald his living skin, dodging the shards of fractured mortar that crunch like tender bones beneath the arch of his foot. A flint splinter cuts a clean incision into the pad of his big toe; he does not pull his foot away, he only clenches his teeth until his molars hurt more than the wound. Blood on the hot stone smells of old tin, of burned cable, of tools left out in the sun.

Behind him, Tarsio's pace is heavy, regular, almost lazy. The unsheathed blade hangs from his fingers with an obscene familiarity, its tip brushing the stones of the floor every four strides with a rhythmic click that sounds like the pendulum of a clock stopped for years.

A gust of white vapor surges from a crack in the floor, engulfing them up to their knees. Visibility is no more than a yard.

A beam of yellow light—oily, trembling, filtered through smoked glass—cuts the fog at chest height. Eusebio waits planted in the turn of the tunnel, signal lantern raised in his left hand, his back pressed against the concave wall of the manifold.

The warden does not move aside or open his mouth. He spits a black thread of thick saliva between two ashlars and lowers the lantern just slightly to look at their feet.

The glass of the lamp trembles with the tired pulse of the old guard, casting concentric circles of soot upon Darío's bare chest and the copper edge of the weapon. None of the three breathes with a mouth closed. The vapor rises, thick as lard, seeking the joints of the flesh.

Beneath Darío's naked soles, the basalt keeps warming, relentless, until there is not a single cold corner left to rest his weight.

"The dampers are at the back, on the left," Eusebio says. "Nobody has touched them since the siege."

Darío finds them by feel: three iron wheels welded shut by scale. Tarsio sets the sword on the ground without being asked and puts his hands next to Darío's, as on the night of the valve; the old burn on their forearms opens again for both of them. The first wheel gives on the fourth pull; the second, on the tenth; the third will not move until Tarsio wedges the sword between the spokes and levers it with his whole weight.

The steam rushes up the flue with the roar of an animal set loose. Below, in the coal galleries, no one will ever know who opened the dampers. At the bend, Eusebio lowers the lantern and looks at Tarsio the way one looks at a man who has stopped being useful.