The hatch under the workshop rug had three locks, two warning plates, and a mushroom growing through the handle.
Felix regarded it with the resentment he usually reserved for early appointments.
“That,” he said, “is too many opinions for a door.”
Jian Tao knelt beside the nearest warning. His clean blue sleeve stopped just short of the damp floor.
“Pressure below. No open flames. No spiritual discharge beyond the yellow boundary.”
“Three good opinions,” Lyra said.
She stood on the bottom rung of the workshop ladder, tightening the belt around her borrowed coat. Her damaged dantian made her careful about how she moved. It had not prevented her from criticizing Felix before breakfast.
Tamsin came through from the kitchen carrying a shuttered lamp. Pell followed with a bread crust in each fist.
“One for the expedition,” he explained.
“We’ve eaten,” Felix said.
“Then two for me.”
Tamsin exchanged the lamp for the sketch Barnaby had found the previous evening. A brass regulator was marked at the third junction beneath the spire. Without it, the replacement return path would remain a plan drawn on expensive paper.
“Bring the whole assembly,” she said. “Not whatever piece looks easiest to carry.”
“My reputation arrives before me.”
“Your laundry did.”
She checked the bandage supporting his right wrist. Yesterday’s rescue had left an ache across his chest and a tremor whenever he tried to move qi. Warm bread had improved his mood. It had done nothing for the injured meridians.
Jian noticed the tremor anyway.
“You observe. You don’t channel.”
“A leadership role.”
“A medical restriction.”
Barnaby landed on the bench. “The distinction has defeated better men.”
They opened the hatch together.
Cold air rose from stone steps descending into the island. Beneath the smell of wet iron lay something faintly sweet, like old apples.
Felix stayed between Lyra and Jian on the stairs. Barnaby went first, lamp hooked beneath his body. Tamsin remained above to prepare the receiving cradle. Pell had been given the important and disappointing duty of keeping his feet away from the opening.
The first tunnel was narrow enough that Felix’s shoulder brushed the wall. Water ran in a channel beside the steps. Every few yards a copper strip crossed the ceiling and disappeared into the rock.
His AetherDeck showed a thin amber line along the strips.
Return circuit. Flow unstable.
That much matched Tamsin’s diagnosis. Below it, the instrument offered an estimated temperature and declined to estimate anything else.
“Healthy restraint,” Felix told it.
“Are you encouraging your slate?” Lyra asked.
“It gets very confident when nobody supervises it.”
At the first junction, Barnaby turned left without hesitation.
At the second, he stopped.
The map showed two passages. There were three.
“An addition,” he said.
The right passage bore fresh white numbers. The center opening had been filled with rubble. On the left, an arrow pointed toward a door labeled STAFF AMENITIES.
Felix brightened.
“No,” said all three companions.
The left passage led to the regulator anyway. The promised amenities consisted of a stone bench facing a blank wall.
“A chair without a back,” Felix said. “Civilization has been declining for longer than I thought.”
A bell rang beneath the bench.
Something scraped behind the wall.
A metal face emerged through a square hatch. It had a painted smile, a single glass eye, and four jointed arms holding brushes.
“Shift change,” it announced. “Remain still for debris removal.”
One brush descended toward Felix’s head.
Lyra caught the arm on the flat of her sword. “No, thank you.”
“Refusal recorded. Cleanliness allowance suspended.”
The face withdrew. A copper shutter slammed across the passage behind them.
Felix looked at the hair caught in the brush.
“I preferred the bench.”
Jian tested the shutter without feeding it qi. “Locked mechanically.”
Barnaby inspected a plate beside the hatch. “Servicing construct. Municipal pattern. It believes we’re incoming maintenance staff.”
“Excellent. Maintenance staff traditionally get to leave.”
“After completing an assigned task.”
The wall hatch opened again. A wheeled platform rolled out carrying six buckets of gray powder.
“Scour eastern intake. Completion expected before shift end.”
“When’s shift end?” Felix asked.
“Upon completion.”
He closed his eyes.
“I’ve had this job.”
Lyra studied the platform. “We don’t need to destroy it.”
“Good,” Jian said. “Those buckets contain abrasive spirit lime. Strike a charged joint and we’ll breathe it.”
Felix lowered the hand he had started to raise. Even pointing felt too much like volunteering.
He crouched, carefully, and found a diagram stamped beside the platform’s wheels. Three circles represented workers. A fourth represented a supervisor. Beneath them, a narrow slot held a chipped slate tab.
“Barnaby. Does this say substitute assignment?”
The owl leaned closer.
“It does. Supervisory authorization required.”
“Can you authorize?”
“I can read. These are different accomplishments.”
Jian illuminated the plate with his copper testing needle. Its tip held a steady thread of pale qi, no brighter than a candlewick.
Felix read the small print.
Employees must be alive when discharged from duty.
For a moment nobody spoke.
“That’s encouraging,” Lyra said finally.
“It means there’s an injury exemption.” Felix traced the next line without touching it. “And a broken equipment exemption. It doesn’t say who broke the equipment.”
Jian looked at him.
“We aren’t breaking it,” Felix said. “We’re reporting what already is.”
He pointed up.
The copper return strip ended at the shutter. A green stain marked a split joint. Water collected there, dripping onto the buckets.
“It wants intake cleaning,” Felix continued. “It hasn’t got a working return. That’s unsafe under its own instructions.”
Barnaby read the relevant wording aloud. The construct’s eye rotated toward the ceiling.
“Fault inspection requires physical verification.”
“Which we cannot provide while enclosed in your cleaning queue,” the owl replied.
A pause.
The shutter rose six inches.
Lyra pushed her sword beneath it to stop the edge dropping on Barnaby. Jian slid the platform’s empty wheel brace into the gap. Felix kept his hands well clear.
The construct rolled back to inspect its damaged joint. Freed of the queue, they slipped through a side door marked REGULATION.
Behind them, the brushes began cleaning the leak.
“Does it know that won’t fix it?” Lyra whispered.
“I suspect its supervisor has been missing for a while,” Felix said.
The third junction opened into a round chamber built around a stone shaft. Copper pipes climbed the walls. Between them stood a brass cylinder the length of Felix’s forearm, mounted inside an iron frame.
Tamsin’s regulator.
A yellow line circled the floor three feet from the shaft.
Jian stopped them before anyone crossed it.
He held his needle above the line. Pale qi bent sideways toward the shaft, then snapped out.
The room hummed.
“Residual pressure,” he said. “No one touch the frame.”
Felix read his screen. Two lines climbed and fell together. A third remained steady.
“The regulator’s supply is dead. The return isn’t.”
“Can you separate the readings?” Jian asked.
“If you hold the light there.”
Lyra moved the lamp while Barnaby consulted the map. Felix shifted to see beneath the frame. His chest pulled painfully. He sat down rather than pretend otherwise.
A maintenance wheel stood behind the cylinder. Its handle had rusted almost through.
“We close that first,” Jian said.
“From this side?” Lyra asked.
He considered the pipework. “It needs a quarter turn. I can keep the flow steady for perhaps twenty breaths.”
Lyra unwound a length of salvage cord from her belt. She looped it around the wheel with her sword point, then laid the blade aside.
Felix wanted to suggest a better knot. He remembered Tamsin tying that knot yesterday and finding nothing wrong with it.
He kept quiet.
Jian touched the needle to a copper contact outside the yellow line. The hum settled into a low note.
“Now.”
Lyra pulled.
The wheel moved a finger’s width. Rust sifted onto the floor.
Felix watched the return reading. “Still rising.”
She changed her footing. Her face tightened, but she pulled with her back and legs rather than her damaged cultivation.
The wheel turned.
A long sigh traveled through the pipes.
“Closed,” Felix said.
Jian broke contact and breathed out. His needle had gone dull red.
Nobody cheered. Lyra sat beside Felix, flexing her hands.
“Beautiful knot,” he said.
“I know.”
Once the readings steadied, they unbolted the frame.
The final bolt refused to move.
Lyra set the spanner again. Its jaws slipped, grazing her knuckles.
“Leave it,” Jian said. “The bracket can travel with the regulator.”
“The bracket’s fixed to the wall.”
Felix examined the assembly from his seat. Two small arrows surrounded the bolt head. They pointed in a direction he did not like.
“Try tightening it.”
Lyra gave him a flat look.
“I understand the objection.”
“Then explain yourself before I weld our only useful discovery to a mountain.”
He pointed out the arrows. Jian crouched to inspect them, then checked the opposite fitting.
“Reverse thread,” he said. “Prevents vibration loosening the mount.”
Lyra turned the spanner the other way. The bolt moved.
Felix felt pleased for exactly as long as it took her to hand him the rusty bolt.
“Your contribution,” she said. “Treasure it.”
He pocketed it. Small was fine. Small and correct had rescued more projects than brilliance shouted across a room.
While they worked, the sealed pipe pulsed again. Its rhythm had no connection to Jian’s breathing or the water dripping down the shaft.
Barnaby recorded the interval aloud. Felix asked him to repeat it twice.
“You doubt my timing?”
“I doubt one measurement. Including mine.”
The owl paused, then gave the intervals again without complaint.
Lyra wrapped a cloth around her scraped knuckles. The cut was shallow. She refused Felix’s offer of his last clean bandage and accepted Jian’s smaller strip instead.
Nobody called that a failure of generosity.
The regulator came free with a clean mechanical click. Its brass surface was tarnished, its seal intact.
Felix felt an unreasonable amount of affection for it.
A real part. They could carry it upstairs and make something better.
Barnaby found the records while Jian secured the cylinder in a sling. A shallow drawer beneath the mounting held waxed sheets, maintenance rolls, and three tablets with fresh date marks.
“These aren’t all old,” he said.
Lyra opened one roll. Names filled narrow columns beside shift lengths and extensions. Several extensions carried the same red stamp.
“Workers,” she said. “Some of these shifts overlap.”
“Copies?” Felix asked.
“Perhaps.”
She wrapped the records in the waxed outer sheet rather than offer a theory as a fact.
Something tapped inside the wall.
Twice quickly. Once after a pause.
Felix checked the deck.
The dead supply pipe remained dark. Beside it, behind an iron panel fastened with lead seals, another line pulsed blue.
“Was that on the map?”
Barnaby tilted his head. “No.”
Jian held up his darkened needle. “And we have no spare insulation.”
Felix looked at the seals. Their stamped edges were clean beneath the dust.
He could imagine lifting one. He could also imagine explaining to Tamsin why he had traded a working regulator for a second disaster.
“Mark it,” he said. “We’re leaving.”
They returned by the unblocked service passage shown on the room’s evacuation plate. It bypassed the cleaning station entirely.
“You found that now?” Lyra asked.
Barnaby’s wings stiffened.
“It was posted on the far side.”
They climbed into warm workshop air. Pell had built a fence of empty stools around the hatch.
“Nobody fell in,” he reported.
“Best result we’ve had all morning,” Felix said.
Tamsin took the regulator with both hands. She examined its seal, turned its adjustment screw, and smiled.
Not politely. Not because anybody had nearly died.
Because its pressure seal still held.
“Yes,” she said. “I can use this.”
Felix sank onto the bench while Jian lowered the records beside him. His wrist ached. His boots were wet. He had missed lunch.
He was still smiling when the deck quietly saved the unknown feed’s rhythm.
Two short pulses.
One long.