Alistair paused, frozen not by fear, but by the sharp assessment of his error. The bronze powder clinging to his palms betrayed him. Katarina’s gray gaze pinned him against the rock face. The cavern went still, broken only by the distant strike of iron picks and the ragged respiration of the miners huddled along the ditch. He swallowed down the limestone grit. His mind mapped the risks, discarding direct defiance in an instant. Rhys Volkov, the body's previous occupant, held a record of groveling piety. That posture remained his sole shield. He dropped his chin and rounded his shoulders into humble submission. “Investigator,” Alistair said, keeping his tone measured. “Vexia blesses all who seek Her light. The salve, flawed by mortal handling, sometimes requires… settling. A clarifying touch.” He raised one hand, tilting his wrist toward the worker whose shoulder still seeped fluid. “I only sought to ease his affliction, to align the preparation.” Katarina did not blink. “Align it, acolyte? The Synod manufactures the holy mixture. Its formula is sacred. To claim it requires correction edges on blasphemy.” Her iron sabaton scraped across the shale as she closed the distance. “Replicate this intervention. Show me how a novice refines the sacred work.” The corridor offered no room for retreat. Defiance guaranteed a blade through the ribs. He had to dress empirical chemistry in theological vestments. He possessed powdered marcasite, dried plant ash, and brine. He required the spoiled jar, plus an improvised strainer. A scrap of homespun cloth sat discarded near the spoil heap beside a shallow clay pot. “The vessel requires preparation,” Alistair said, adopting a measured cadence as he gathered the bowl. He dropped to his knees, smoothing the rag with his thumb. “The channel must be cleared so the blessing finds purchase.” He stretched the weave over the clay rim. “Fetch the spoiled batch,” Katarina told the sentries. A guard hurried to a crate, his hands trembling as he lifted an earthenware jar. The sharp stench of rancid oil and oxidized copper drifted out. Alistair set the fabric across the basin's lip. From his pouch he drew a measure of crushed root ash, spreading the gray powder evenly over the weave. “The ash purges impurity,” he murmured, pitching his tone to liturgical rhythm. “It absorbs spiritual dross.” He sprinkled ditch water over the top, dampening the bed into an alkaline mat to strip free fatty acids and precipitate metal salts. He tipped the curdled mixture across the ash bed. The dark sludge pooled, then strained through drop by drop into the clay beneath. The rank copper tang diminished as the liquid filtered out, turning from turbid green to a pale, translucent amber. Physical filtration caught the coarse particulate, while the alkaline bed saponified the foul free lipids. He dabbed the clarified fluid onto his thumb, holding it toward the light. “The blessing settled,” he said, nodding toward the laborer. “Free of corrupting sediment.” Katarina did not move. Her eyes shifted from the amber pool to Alistair's neutral face, calculating. The result stood plain before her, yet its systematic clarity challenged orthodox miracle claims. “The heat,” she said. “The overseer reported warmth. A divine current in your hands.” A cold prickle hit the back of Alistair’s neck. His crude chemical cell only produced voltage; thermal generation was minimal. “A vessel must warm before it can receive,” he replied, rising with deliberate calm. He turned toward his pallet, shielding his reach from view. He slipped his palm beneath the rotting straw, grasping the paired slate-and-pyrite cell. It held faint warmth from his body, nothing more, but the charge remained active. He pivoted back, presenting his closed hand. “Test the vessel, Inquisitor.” Katarina studied him for two beats. Unbuckling her gauntlet, she slipped off the iron plate to reveal pale, scarred skin. She brought her bare palm flat against his. When her skin met the exposed wire end, an audible snap sparked between their flesh. The discharge bit into Alistair's skin, while Katarina broke contact with a sharp intake of air, her pupils contracting as her shoulder twitched back. “A sharp vigor,” she whispered, curling her knuckles into her palm. She held his gaze with intense scrutiny. “Apply your clarified mixture to the injured laborer, Acolyte Volkov. We will record the recovery rate.” She turned on her heel, iron greaves clattering against rock as she marched up the tunnel, the escort trailing in her wake. Hours later, in a dry hollow converted into command quarters, Katarina leaned over a brass thurible. Resin smoke rose in pale ribbons toward the ceiling. With a silver stylus and luminescent ink, she inscribed dense cyphers across a strip of vellum, masking numerals beneath litany phrases. She rolled the sheet, slipped it into the perforated vent beneath the coals, and blew gently to stoke the embers. Chemical trace in the ink altered the smoke plumes, drafting patterns along the ventilation shaft intended for Father Kirill’s couriers rather than the High Pontifex. Her cipher ran concise: *The subject is no fanatic. He is a mechanical variable.* Alistair lay on his wooden frame, deconstructing her response. The inquisitor possessed sharp instincts; she recognized methodology when she saw it. Reaching beneath the pallet to stow the cell, his knuckles brushed an unfamiliar seam in the timber plank. He worked his nails into the gap and pried back a false slat. Inside lay a calfskin booklet, corners stained with sweat and lime dust. Rhys Volkov’s personal notes. Alistair cracked the brittle binding. The ink on the opening leaf stood out jagged and rushed: *They know what I am. The blood is the key.*

A Quiet Hypothesis