Midday in Oakhaven brought no warmth, only a shift in the color of the smog from leaden gray to the sickly, sulfurous yellow of an infected wound.
Gantry Nine was suspended sixty feet above the churning maw of the Great Gear. The wind up here was fierce, carrying with it a spray of aerosolized whale oil and scalding vapor that clung to the iron grating like dew on grass. A crowd of three hundred guild laborers had gathered along the lower catwalks, their faces grim, their shoulders hunched against the biting chill. None of them dared speak; the only sound was the deafening thrum-click, thrum-click of the bronze teeth below, and the periodic hiss of the steam rifles carried by the cordon of Iron Guards.
At the center of the gantry, suspended over the abyss by a rusty cargo chain, was a heavy iron cage. Inside it, kneeling on the cold bar floor, was Master Linus. His multi-lens loupe had been torn from his face, leaving his scarred, half-blind eye exposed to the stinging wind. His pneumatic cane lay splintered on the gantry floor ten feet away.
Standing beside the hoist mechanism was Lieutenant Vance Thorne of the Praetorian Guard. Unlike the common ironclad grunts of the city patrol, Thorne wore armor of lacquered obsidian steel, trimmed with polished brass filigree that marked him as an officer from the High Spire. At his hip hung an aether-saber, its pommel humming with a dormant, violet energy coil.
Thorne glanced at an ornate silver pocket watch, then snapped it shut with an audible click.
"Apprentice Silas Vance has failed to answer the summons," Thorne announced. His voice was carried across the gantry by a mechanical horn mounted to his breastplate, cold, resonant, and devoid of human warmth. "By the authority of the High Archon, the harboring of state fugitives is treason. The punishment is forfeiture of citizenship and immediate mechanical reclamation."
He gestured to the winch operator—a terrified junior mechanic whose hands shook violently against the iron lever.
"Drop the cage ten paces," Thorne commanded.
"Wait!"
The shout came not from the catwalks, but from above.
Thorne frowned, tilting his head upward. High on the skeletal framework of the steam exhaust ducts that towered above Gantry Nine, a lone figure stood balanced precariously on an eighteen-inch high-pressure main.
Silas Vance stood with his coat flapping in the howling wind, his face obscured by grease-streaked leather goggles. In his left hand, he held a heavy pneumatic torque wrench; in his right, he held the valve-wheel of the Primary Bypass Conduit—the central pressure release for the entire lower district.
A collective gasp rippled through the crowd of laborers below. Every mechanic on that gantry knew what that valve controlled. It regulated the superheated steam feeding the main drive pistons of the Great Gear.
"Step away from the winch, Lieutenant!" Silas roared, his voice battling the wind and the deafening clatter of the machinery. "Or I open the primary bypass completely!"
Thorne did not look alarmed; instead, an amused sneer curled his thin lips. He stepped to the edge of the catwalk, looking up at the young mechanic.
"You threaten to flood the sector with live steam, boy?" Thorne said, his amplified voice echoing mockingly. "You would scald yourself to cinders before the pressure drop even registered on my cuirass."
"I wouldn't just scald myself, Thorne!" Silas yelled back. He tapped the heavy steel pipe beneath his boots with the head of his spanner. The metal rang with a dull, strained pitch—the sound of an artery ready to burst. "I adjusted the safety governors three hours ago. I diverted the auxiliary return from Boilers One through Four directly into this bypass loop! If I turn this wheel three revolutions counter-clockwise, forty thousand pounds of pressurized steam will detonate inside the main manifold. It won't just kill me. It will tear the entire foundation of Gantry Nine from the rock wall and drop this whole platform—and your precious guards—into the teeth of the Great Gear!"
The guardsmen on the gantry exchanged nervous glances beneath their iron helmets. Their boots shifted against the grating. They knew the layout of the foundries; they knew the sheer, unbridled violence of an uncontrolled boiler explosion.
Thorne’s smile vanished. His hand dropped instinctively to the hilt of his aether-saber. "You're bluffing, mechanic. You wouldn't kill your own guild master."
"Look at the pressure gauge on your left stanchion, Lieutenant!" Silas shouted.
Thorne flicked his gaze toward the bronze dial mounted to the gantry support. The needle was pinned hard against the red sector, vibrating so violently that the glass cover had cracked from the stress.
The young man was not bluffing. He had turned the entire sector into a bomb.
"Raise the cage," Thorne said coldly, not taking his eyes off Silas.
The terrified winch mechanic threw the lever into reverse. The iron chain groaned as the cage was hauled upward, swinging wildly over the abyss until it clattered back onto the safety of the gantry deck. Two guards unlocked the iron gate and dragged Master Linus out, dumping the bruised old man onto the grating.
"Now," Thorne said, stepping forward, his eyes narrowed behind his visor. "Step down from the conduit, Vance. Deliver the girl and the artifact, and I will permit your master to die of old age in the workhouses rather than hanging him today."
"I don't have the girl," Silas lied smoothly, keeping his hand tight on the valve wheel. "She died in the sump culverts an hour ago. Her body was washed down into the deep vents."
"You lie," Thorne spat. "The chronal resonance scan registered an active pulse within Sector Four less than twenty minutes ago. She is alive, and she has the Core. Tell me where she is, or I will peel the skin from your mentor's hands one finger at a time."
"Then you'd better start with the toes, you bastard!" old Linus roared from the floor, coughing a spray of blood onto Thorne's polished boots. "Turn the wheel, Silas! Blow the whole damned mountain to hell!"
Thorne drew his foot back and kicked the old man savagely in the ribs. Linus groaned, collapsing into a heap.
The rage that surged through Silas was cold, precise, and entirely mechanical. He had calculated this exchange down to the second. He knew Thorne would never let either of them walk away; the Praetorian Guard did not negotiate with grease monkeys. The stand-off was never meant to secure Linus's freedom.
It was meant to buy time for the pressure to peak.
Now, Silas thought.
He didn't turn the valve three revolutions counter-clockwise. Instead, he pulled the three magnesium flares from his pocket, struck the friction caps against the rough iron pipe, and hurled them down not at Thorne, but directly into the open lubricant reservoirs feeding the Great Gear's central axis below.
The flares struck the thick, highly volatile pools of whale oil and grease.
An instantaneous roar of blinding white fire erupted from the pit. The intense thermal wave struck the bottom of the gantry like a solid fist, sending billowing clouds of acrid, blinding white smoke rushing up through the iron grating.
The crowd of laborers screamed, panicking as thick smoke swallowed the catwalks. The steam-hounds shrieked, their optical sensors blinded by the dazzling glare of burning magnesium.
"Fire!" someone screamed. "The sumps are on fire!"
"Hold your positions!" Thorne bellowed, drawing his aether-saber. The blade ignited with a terrifying, high-pitched hum of pure violet plasma, slicing through the smoke like a laser. "Kill the boy!"
The guards raised their rifles and fired blindly into the scaffolding above. Heavy lead slugs pinged off the steam pipes, throwing sparks and puncturing small jets of scalding vapor.
Silas did not wait to be hit. He threw his weight against the bypass valve, turning it just half a turn—enough to vent a deafening wall of steam directly between himself and the guards below. Under cover of the roaring white fog, he hooked his pneumatic grapnel gun to the overhead trolley cable and pulled the trigger.
The steel hook bit into the cable with a dull clang. Silas stepped off the high pipe into empty air, his grapnel line whirring as he slid through the dense smoke, flying over the heads of the panicked guards, across the burning pit of the Great Gear, toward the dark, forgotten service shafts of the western wall.