The Sulfur Dust

How does a man keep eighty quarantined convicts from rioting when their evening kettle must be dumped in secret? Arslanbek stood in the damp scullery passage behind the refectory, weighing an iron ladle in one hand and his master key in the other, watching the scullery hearth before the eighty men in the outer hall had taken their seats.

Behind him, the heavy bronze eighth bell hung silent in its stone housing, twenty minutes from striking.

"Tell them the tallow spoiled," Arslanbek muttered to Timur-bek, who hovered near the pantry arches with sweat gleaming across his waxen forehead. "Tell them a dead gull fell down the chimney flue. Tell them whatever keeps eighty pairs of hands from tearing your robes off your shoulders, but do not let a single tin cup near that copper vat."

Timur-bek rubbed his palms against his tunic, his breathing shallow and quick. "They have not had warm broth since noon, Arslanbek. If I order the cauldron dumped, they will break the mess benches. Half of them are mutinous draymen and cashiered sergeants."

"Then let them break the benches. Oak planks can be mended with wooden dowels; if the poisoner was handling the ladle jug at this hearth, we cannot trust a single drop from this kitchen. Pick up the iron poker and help me overturn the kettle before the dining doors open."

Arslanbek stepped into the scullery alcove, his heavy tread ringing against the wet flagstones. The scullery orderly, Selim-oglu, stood by the massive brass cauldron with a linen cloth tucked into his hemp belt, his fingers twitching against the iron handle. When Arslanbek approached, Selim-oglu took half a step backward, nearly tripping over a stack of pewter trenchers.

"Stand away from the spout, Selim," Arslanbek said, his voice hard in the empty kitchen.

"The... the water has just boiled, Master Arslanbek," Selim-oglu stammered, pointing a shaky thumb at the copper lid. "Brother Oghuz said the men needed the hot water drawn before the bell."

"Brother Oghuz can steep his beard in it," Arslanbek said. He gripped the iron ring on the cauldron's side, levered the lip toward the central drainage trough, and kicked the rear support block out from under the brazier.

Forty gallons of boiling water surged across the scullery floor in a hissing deluge of steam and sodden leaves. The scalding flood roared down the grease-grate, carrying away the fresh sage before a single ladle could touch it.

Outside the closed oak doors, the first muffled murmurs of eighty convicts echoed down the corridor as the men queued for the eighth bell.

"Tell them the tallow in the kettle lining went sour," Arslanbek said to Timur-bek, gesturing toward the empty copper shell. "Unless you want men vomiting black bile into the latrine trench before midnight, order the assistants to haul buckets of cold, unadulterated water from the deep north cistern. They will complain about cold water, but cold water breeds no corpses."

Timur-bek nodded hurriedly, rushing out to intercept the orderly staff before the mess doors were unbarred.

Arslanbek did not linger to watch the grumbling subside. He caught Timur-bek by the elbow, pulling the trembling administrator into the arched corridor that led toward the private quarantine cells of the upper terrace.

"The boy Yunus is purged and sleeping in my dispensary store," Arslanbek said in a crisp, measured tone that carried easily down the drafty passage. Several orderlies and three walking convalescents from the southern ward leaned out of their doorways to listen. "He coughed up enough root sediment to identify the exact strain. It is high-grade mainland wolfsbane."

Timur-bek blinked, his eyes darting toward the shadows. "You know what it was?"

"I distilled the antidote an hour ago," Arslanbek said, pitching his voice so it echoed off the vaulted ceiling toward the kitchen hatch. "A simple tincture of calcined potash, vinegar, and boiled wood ash. I placed three flagons of the neutralizer in the iron-bound apothecary cupboard in the lower dispensary vault. If anyone shows the numbness or the blue lip, one swallow reverses the heart-spasm within twenty heartbeats."

Timur-bek opened his mouth to reply, but Arslanbek squeezed the administrator's forearm with enough force to bruise the muscle beneath the wool.

"The cupboard is locked with the heavy brass padlock," Arslanbek added, enunciating each syllable. "No one enters the lower dispensary tonight without my master key. The cure remains under lock until morning inspection."

He released Timur-bek, turned on his heel, and walked down the damp spiral stairwell that plunged into the cliff foundations.

Beneath the living quarters, the dispensary vault smelled of dried mint, camphor, and sea salt seepage. Arslanbek shut the heavy timber door behind him, dropped the iron bolt into place, and lit a single tallow candle.

He had no antidote. Calcined potash and vinegar were good for scouring greasy cauldrons, but they would not reverse aconite once the alkaloid seized the heart. The assassin, however, could not afford to let an effective remedy survive on the rock. If eighty men recovered from their symptoms or if Yunus testified after a night of recovery, the murderer's purpose was broken. The killer would come for the cupboard before the dawn bell.

Arslanbek approached the tall oak cabinet anchored into the granite wall. He pulled a pigskin pouch from his vest and untied the hemp cord. Inside lay a fine, bright yellow powder—crude brimstone ground with lampblack and tallow-grease until it clung like dry flour to every surface it touched.

Working by the tallow flame, he took a soft hare's-foot brush and dipped it into the sulfur dust. With steady, practiced fingers, he coated the inner teeth of the heavy brass padlock. He brushed the yellow powder into the keyway, around the iron hasp, and inside the narrow crevice where the sliding bolt met the timber frame.

Anyone who slipped a tension wire or an oiled pick into that keyway would find their tools coated in microscopic yellow grains. The sulfur-tallow blend was designed to work into the crevices of a man's fingers, staining the cuticles and the underside of the fingernails with an indelible yellow crust that required three scalding washes with lye soap to scrub clean.

When the lock was primed, Arslanbek blew away the loose grains from the exterior wood, leaving the trap invisible to anyone working in the dark.

He set the candle on the slate worktable, unhooked his sheepskin cloak, and sat down on the low wooden stool beside the door. He picked up his bone spatula and a small whetstone, drawing the smooth horn along the slate with a dry, rhythmic hiss.

Hours bled away into the damp chill of the vault. Above, the distant toll of the tenth bell vibrated down through sixty feet of solid limestone. Later, the eleventh bell chimed its muffled iron note into the howling sea-wind.

Then came the midnight toll.

On the third stroke of the midnight bell, the heavy timber latch on the vault door shuddered.

Arslanbek did not move. He kept his breath even, his boots tucked beneath the stool in the deep shadow of the doorway arch.

A thin iron wire slipped through the gap between the door and the jamb, feeling for the internal bolt. The intruder found the timber block in place, paused, and withdrew the wire with a soft scrape of metal on iron.

A moment later, a faint click sounded at the low ventilation grille near the floor—a narrow chute used to draw dry cliff air into the herb cellar. The grille swung open an inch on rusted hinges. A gloved arm slid through, carrying a long, curved skeleton pick aimed directly at the cupboard padlock twenty inches away.

The iron pick entered the brass keyway. The intruder probed the internal tumblers, twisting the wire with urgent, frantic jerks.

There was a sharp snap.

The brass tumbler held, but the pick scraped violently against the sulfur-packed cylinder. A muffled gasp of frustration drifted through the grille, followed by the hurried clatter of withdrawing iron. Soft footsteps retreated across the upper flagstones, fading into the roar of the surf beating against Tash-Bashi's northern cliffs.

Arslanbek rose from his stool. He carried the candle to the oak cabinet and held the flame close to the brass plate.

The keyhole was ringed with freshly smeared yellow dust. Two distinct scratch marks gouged the metal face, and a torn scrap of coarse gray linen lay trapped in the sulfur-coated hasp.

The trap had closed. In six hours, when morning inspection began, every warden on the rock would show their hands to the light.