The hall beyond the writing hall dropped into the sub-basement vaults where the air grew warm, dry, and unnaturally sweet.
It was an oppressive, choking heat—not the damp steam of a laundry or the clean warmth of a hearth fire, but the dry, static heat of an electric fire. Every surface in the passage was coated in a fine, glittering dust that sparkled like diamond powder under Brother Ren’s animal fat flame.
Ren knelt on the slate floor. He rubbed a pinch of the glittering dust between his gloved thumb and forefinger.
“Crystal-clear quartz flour,” Ren said, holding it to his nose. “Crushed human marrow. When the deep ring runs through the copper pipes, the friction grinds tiny flakes off the internal channels. They vent the exhaust dust into these lower passages.”
“A health hazard of spectacular proportions,” Vane remarked. He pulled his vinegar-soaked rag tighter across his face. “Breath in of quartz dust leads to acute lung fibrosis within twenty-four months. I presume the choirboys rotate their apprentices through this hall to ensure early mortality before they can request pensions.”
Above their heads, suspended from the vaulted ceiling by heavy iron cradles, ran the channels.
There were four of them. Massive, four-inch pipes forged from cold-drawn copper. It was wrapped in oiled linen strips and bound with copper wire. They didn’t lie still. They shook.
A nonstop, low-hum rang through the metal. A deep, sound drone tuned to the concert pitch of pure silver that buzzed in the fillings of Ren’s teeth and set his ear drums thrumming with a dizzying, nauseating pressure.
Hummmmmmmmm.
“The ringing hum of consecrated silver,” Ren muttered, looking up at the pipes. “The same hum that was driving the crystal-forming in Mira’s chest.”
“It’s worse than that,” Vane said. He pointed his cane at a bronze pressure gauge bolted to a pipe junction. “Look at the high-pressure needle. The fluid is high-pressure to twelve sea-weights. What are they pumping through there?”
Ren drew his awl. He used the scraping edge to carefully peel back an inch of the oiled linen wrapping around a brass check petcock.
He cracked the valve a quarter-turn.
A hiss of scalding, high-pressure vapor escaped. It was followed by a slow, syrupy drip of glowing fluid. Ren caught a drop on the silver metal ring of his awl.
The fluid was rainbow-bright. A thick, sticky mixture of consecrated stone salt water, liquid silver, and tiny suspended quartz needles that glowed with a faint, lavender soft glow. The moment the fluid touched the silver metal ring, Ren’s bone awl shook in his hand. It hummed with a high, clear note that rang through his arm bones.
“Consecrated lymph,” Ren said, his voice flat with horror. “They liquefy the amputated crystal-clear limbs and pump the ringing slurry through the pipes to maintain the current-carrying charge across the entire cathedral grid.”
Brother Ren stopped directly beneath the pipes. He tilted his head, his hollow, silver-flecked eyes gazing upward at the dark copper.
Slowly, deliberately, the monk reached up with his bare, scarred right hand. Then he pressed his calloused palm against the bare metal of the main channel.
Martyr’s Osmosis: Acoustic Inquest.
Brother Ren’s entire body went rigid.
A bone-shaking blast wave rippled through his burlap habit. The three quartz needles protruding from his right collarbone flared with brilliant violet soft glow, chiming in sympathetic deep ring with the copper pipe.
The monk’s eyes rolled back until only the whites showed. His jaw dropped open in a silent, agonized gasp as the sense channel flooded his nervous system with the collective sound scream trapped inside the pipe.
“Brother!” Ren lunged forward, grabbing the monk’s waist to pull him away.
“Leave... Leave me,” Brother Ren whispered, his voice shaking so hard the words tore in his throat. “I must... I must hear them. The contract needs a clerk.”
“He’s tapping the carrier hum,” Vane said. His monocle shone as he leaned back against the limestone wall, his counting frame clicking wildly. “The copper pipes carry a high-pressure fluid medium soaked with quartz dust to conduct the shaking charge. If he connects his nervous system, he’s experiencing thirty-two ringing sources at the same time!”
Ren looked at Brother Ren’s face.
Tears of blood were leaking from the corners of the monk’s eyes, running down his scarred cheeks and dripping into the front of his habit. Yet his expression was not one of horror. It was one of heartbreaking, bottomless sorrow.
“They’re crying, Ren,” Brother Ren whispered, his scarred palm leftover fused to the copper. “In the dark. They don’t know where the sun went. A boy... His name is Lucas. He’s eight. He wants his mother to bring his wooden horse. A girl... Little Elspeth... She’s singing a nursery rhyme about the spring thaws in Low-Khorat to keep from feeling the copper needles in her ribs.”
The monk’s right shoulder began to blister. The violent, high-intensity sound shaking carried by the consecrated fluid was searing his meat, raising angry, milk-white burns across his forearm matching to the blisters on Ren’s chest.
Yet Brother Ren didn’t pull his hand away. Instead, he began to sing.
His voice was hoarse, ruined by years of absorbing plague. But as he sang, the melody was soft, beautiful, and infinitely gentle:
“Sleep, little sparrow, beneath the cold slate,
The winter is long and the shadows are late. The river is sleeping, the ice has no voice,
And grief is the price of a beautiful choice...”
The sound traveled through his flesh, into the copper pipe.
Fifty paces down the channel, inside the unseen vaults of the Weeping Cistern, the wild, jagged shaking of the copper began to smooth out. The high-pitched, panicked back-and-forth swing of the thirty-two dying children eased, their sound hum stabilizing as the monk’s body song absorbed their fear through the metal.
Brother Ren finally pulled his hand from the pipe, stumbling backward into Ren’s arms.
His right palm was scorched black, the skin peeling away in blistered ribbons. But he looked down at his ruined hand with a faint, peaceful smile.
“They know we’re here, Ren,” the monk murmured. He leaned heavily against Ren’s shoulder, his breath coming in ragged gasps. “The children know their brother has come to the door.”
Ren looked up at the copper pipes.
His mammoth bone awl felt hot against his ribs. The cold, clockwork anger that had guided him through the legal ledgers was gone, replaced by a dark, towering fury that had no words, no clauses, and no loopholes.
“Where do the pipes lead, Brother?” Ren asked, his voice shaking with lethal quietude.
Brother Ren lifted his uninjured left arm. He pointed toward a massive, iron-studded oak door at the end of the hall. He was flanked by two stone statues of weeping angels.
“The Weeping Cistern,” Brother Ren whispered. “Behind the Iron Guardian.”
Ren touched the silver metal ring of his awl to the weeping brass petcock once more. He felt the high-hum shaking buzz through his teeth.
“The deep ring isn’t stable,” Ren observed, his careful scribe’s training piecing together the clockwork equation. “The sound wave is pulsing in irregular intervals—three long cycles followed by a sharp, clashing spike. The quartz crystals inside the pipes are undergoing deep wear.”
“Because quartz isn’t iron,” Vane said, shining his small brass lantern along the line of copper channels. “Under nonstop ringing stimulation, quartz dust lattices develop tiny stress-fractures. If the hum isn’t nonstop tuned by a master worker, the crystals reach their total ringing threshold and shatter into tiny powder. That’s why they need Mira. They don’t just need a resonator. They need a self-healing core to stabilize the entire pipe hub.”
Ren wiped a streak of glowing salt water from his glove. “If the fluid medium breaches under this pressure, the aerosolized liquid silver and quartz dust will fill the sub-basement within thirty seconds. It would act like a skin-burning nerve agent.”
“Another reason to avoid manual labor in ecclesiastical public works,” Vane muttered, adjusting his cravat. “The safety margins are a total joke.”
Brother Ren looked at his blistered palm. There, the skin was still smoking faintly from the contact with the copper pipe.
“The children can’t hold the hum much longer, Ren,” the monk murmured. His voice was heavy with grief. “Their marrow is weeping. In my world, when the deep ring fractured, the copper pipes exploded through the cathedral floor like cannon fire. A hundred people died in the choir stalls, cut to ribbons by flying shards of singing quartz. We must reach the main pipe hub before Malachai engages the backup boiler.”
Ren looked down the long hall where the copper pipes disappeared into the darkness. “How many children are in the main vat, Brother?”
“Thirty-two,” Brother Ren answered, his voice trembling. “Twelve boys, twenty girls. All between the ages of seven and thirteen. The Choir kept them in induced coma with poppy syrup, but the frozen stillness is failing. The copper pipes are drawing more current than their hearts can generate. If we don’t sever the spreading lines tonight, their lungs will turn to solid glass before tomorrow’s vespers.”
Ren tightened the leather straps of his satchel. “Then we don’t pick the locks. We breach the inner chamber.”