The Last Filing of Dawn

The hemp and white-lead gasket of the lower blowdown valve oozed a thread of grayish slime across the slate floor of the pit. The secondary rocker arm fell forty-two times a minute against its lead stop, a dry strike that tolerated not the slightest play without the nozzle spitting boiling condensate. Anselm had his chin pressed against the bib of his cracked leather apron. Steam rose from the bottom boilers with a pasty stench of rancid lard and burnt lubricant, with that sour base of sulfur that clung to the palate like a layer of cold wax. Through the star-shaped fissure in his left lens—three identical splinters for every incandescent point—the circular peep sights framed the blind oscillation of the pistons against the damp stone.

The pewter bracket riveted to the crest of his temporal bone vibrated with a sharp hum, a sonic needle that seemed to scrape directly at the root of his upper molars before scattering toward the socket of his left eye in a pulse of cold static. Anselm swallowed, but found only the brackish taste of oxide dust floating suspended in the vapor of the blowdowns. He brought his right hand to his neck to fasten the chipped bone button of his tunic—a futile gesture he repeated every time the pressure in the ducts surged without warning—and shifted his body's weight to his right leg; the left one, dead inside its brace, ached after three hours crouching on the cast-iron grating, a dull, old stab that throbbed to the exact rhythm of the connecting rods.

The brass tube of the acoustic communication, embedded between the ashlar blocks supporting the choir stalls, let out a metallic click followed by the harsh friction of a coarse woolen sleeve against the mouthpiece.

"Is there anything left in the jug below?" asked Sister Melisenda's voice. It sounded muffled by the waxed-cloth muzzle.

Anselm did not lift his eyes from the camshaft.

"It spilled when I opened the secondary blowdown," he replied, checking the play of the bronze bushing with the pad of his thumb.

"It had lime sediment at the bottom."

"Yes."

"It tasted like wet plaster."

"Plaster and soot," he said.

Silence.

Above, the oak timber creaked beneath the hobnailed soles of twelve monks taking their seats for dawn prayers, followed by the heavy rustle of copes unfolding over the wooden platform. At the exact same second, Brother Bellows's pneumatic distributor opened its ports with an authoritative puff. The liturgical carillon engaged its drive pinion with a sharp groan and the twin blades of the scaffold began their regulated descent, biting a fraction of an inch with every cycle of the anchor escapement.

Anselm unhooked the twelve-inch bastard file from his pocket, the one with the hornbeam handle split longitudinally and bound with three turns of oxidized copper wire. He had a brass splinter driven beneath the nail of his index finger since the day before; he pressed the edge of his finger against the spine of the tool to dull the pain, but only managed to stain the steel's grooves with a drop of dark blood. The escapement fell and rose before him in a dull clash of bronze against hardened steel that reverberated in his sternum. If he tried to jam the rotation by thrusting the tang into the free gap between tooth and gear, the accumulated torsion in the shaft would seek the point of least resistance through the bones of his own forearm before deforming the casting. If only he had kept the quick-release lever that the master of keys had taken from him during the last inventory, he could have disengaged the wheel without crushing his hand.

But he hadn't.

Any adjustment mechanic would have taken a step back toward the escape hatch before the pressure blew the hemp seals. Anselm rested the bastard file diagonally across the bench, wedging the rough heel against the crest of the drive tooth and bracing the bare palm of his left hand between the wooden handle and the support, turning his own tendons into the only elastic stop. The pewter stirrup at his temple emitted a muffled howl, a discharge of pure vibration that blurred the left half of his visual field with a white flash. A warm thread of blood ran down the side of his nose, slipped over his lip tasting of salt, and crashed against the oily shavings of the sheet metal.

The toothed crown bit into the file with a brutal impact. The anchor burst with a jerk that tore Anselm's palm open and jammed Brother Bellows's cylinder halfway through its stroke, leaving the blades stalled midway up the dais. The counter-blow snapped the hardened tang with a crack like green bone splitting in two, twisting Anselm's thumb and carpus against the grooves of the handwheel in a muffled burst of torn ligaments. Above, the agonizing whistle of steam trapped in the chambers echoed like a torn bellows, drowning out the monks' cries in the stalls as the overpressure valves spewed white jets that enveloped the altars in a boiling fog.

Anselm fell to his knees on the flagstones stained with cold grease, clutching his shattered hand to his chest as his breath came in short wheezes. The clatter of the anchor had fallen silent for the first time in seven months; only the cavernous hiss of steam escaping through the lead joints remained. With his right hand, clumsy and smudged with soot, he tore off his fogged glasses and wiped the back of his forearm across his eyelids. The flagstones beneath his legs were freezing.