Pet Collars in the Ash

How many dead dogs does it take to clog an intake pipe before the landlord notices the smell? I had my boots wedged against the lime-cracked mortar of the third-floor flue, my fingers clamped onto the freed latch of the inspection hatch, and my mind entirely fixed on getting Lázaro through that iron door before the swarm reached our ankles.

With the wingnut already twisted clear, I shoved my shoulder into the plate. The hatch gave two inches, groaned under forty years of settled soot, and swung open with a hollow thud that echoed into an unexpected void.

"In, boy," I growled, grabbing Lázaro by the scruff of his canvas jacket. "Don't tap the threshold. Crawl flat."

Without his safety tether, the boy moved like a spider with bruised ribs, dragging himself belly-first over the raised iron lip. I hauled my frame in behind him, dragging the twin-tank brine rig through the narrow aperture. The brass cylinders scraped against the iron frame with a sharp clatter that set my teeth on edge. Swiveling on my knees, I pulled the heavy hatch shut, rammed the latch down, and jammed my spare steel flue-chisel into the hasp to lock it tight.

The deafening rumble of the open chimney died instantly, muffled behind four inches of municipal cast iron.

We were kneeling in an abandoned utility node, an octagonal brick pocket built between the flue walls during the first canopy expansion. The air here was stale and dry as powdered bone, but free of the greasy draft that had nearly roasted our skins in the main stack. Above us, the vault vanished into thick cobwebs of greasy soot. Below, the iron floor-grate was buried under six inches of drifted ash.

Lázaro collapsed against a stack of discarded firebricks, his chest heaving under his soot-stained vest. He choked, a dry, rattling cough that sounded like two slate tiles scraping together.

"Spit it out," I told him, dropping my scraper onto my knee and loosening the straps of the compressor harness. "Don't swallow the grit. You swallow the pitch, you cough blood by sunrise."

He spat a black gob onto the iron grating, wiping his mouth with a trembling sleeve. "The tank, Master Mateiro. Did we spend the whole charge?"

I unlatched the pressure gauge on the brine rig's left shoulder. The needle hovered at two bars, shivering against the brass stop pin. "Two bars left. Enough for one good blast if a weaver gets within spitting distance, but the secondary valve is sticking. Heat warped the copper housing when that scout tried to vomit its pitch into our faces."

I unbuckled my tool roll, drew out the flat tang of my scraper, and set to work. A proper sweep knows every burr on his gear by touch alone; when your eyes are half-blinded by sulfur scale, your fingers do the measuring. I loosened the retaining sleeve on the brass check-valve, popped the seating spring, and felt along the internal leather flapper. Soot had baked into the seal, turning the oiled hide as stiff as dried cod.

With the scraper tang, I scraped the charred crust from the brass seat, smoothed the leather with tallow from my pocket tin, and reseated the assembly until the spring clicked true. It took four minutes in the dark, working entirely by the faint greenish seep of gaslight bleeding through the mortar seams. When I tested the hand-pump lever, the piston bit with a firm, pneumatic thump.

Lázaro watched my hands, his breathing slowing to a shallow rhythm. "It smells like roasted fat in here, Master. Like the grease-traps behind the butcher's row."

"Smells better than Baron Morillo's parlor," I muttered, wiping grease onto my trousers. "Down in the Lower Flues we only smell honest coal and dead vermin. Up on the Iron Promenade, those bastards bathe in rosewater and lavender to hide the fact that their blood runs on sulfur and boiled lard."

The boy managed a faint, breathy snort, then stiffened.

His boot had brushed against a mound of gray ash near the rusted tool rack on the far wall. The ash drifted aside, exposing a cluster of small, pale curves.

Ribs. Tiny femurs. Jawbones no larger than my thumb.

I picked up my matchbox, struck a sulfur tip against the iron wall, and held the brief, spitting flare over the drift.

The floor was littered with collars.

Dozens of them lay tangled in the accumulated soot, their leather cracked and scorched, their metal buckles corroded green by chemical vapor. Some were cheap strips of hemp tied with lead wire, the kind poor tenement weavers put on their ratters to keep them from the cook-pots. Others were tooled pigskin, decorated with stamped brass studs.

Lázaro leaned forward, his fingers hesitating inches above a pile of blackened wire. "Mistress Varo's tabby was not the first one."

"Not by a hundred," I said.

My thumb hooked an intact strap from the center of the pile. The leather was supple, dyed a deep crimson that soot could not entirely disguise. Suspended from the brass D-ring was an enameled medallion, polished clean by some obsessive sweep before it had been dragged into this furnace.

I rubbed the soot from the brass plate. Stamped deep into the metal was a municipal crest—the three interlocking gears of the Upper Promenade—and an engraved address: Number 4, The Glass Terrace.

Lázaro stared at the medallion, his voice dropping to a whisper. "That's three miles across the canal. In the High Quarter. Why would a noble lady's lapdog be inside a third-floor chimney in Casa Trilla?"

"It didn't walk here across the bridges," I said.

I dropped the collar, turned toward the back corner of the node, and kicked away the mountain of ash accumulated beneath the rusted tool rack. Behind the gray dust lay a heavy iron bracket holding a four-foot municipal hex-wrench, its jaws notched to fit the high-pressure gas mains. The tool was stamped with the same three-gear insignia, coated in protective cosmoline that had kept the steel from rusting.

I lifted the wrench from its mounts. The iron was cold, solid, and balanced with the brutal heft of city property. A tool like this did not belong in a private boardinghouse flue; it belonged to the municipal dampener squads who patrol the arterial pipelines.

Just beneath the tool rack, half-buried in the brickwork, sat the reason the ash was warm.

Branching off the six-inch municipal cast-iron sleeve I had uncovered on our way down, a secondary four-inch bronze line—wrapped in fire-resistant asbestos tape—emerged from the floor plates. It completed the bypass, routing fuel around every meter and domestic valve before plunging straight into the lower cavity of the central chimney breast through a fresh mortar plug. The iron valve on the pipe was turned fully parallel to the bore—open wide, feeding a continuous torrent of pressurized coal-gas into the belly of the stack.

Near the valve wheel, pressed into the cooling mortar, were four distinct indentations. Claws. Not the thin, spindly marks of the four-foot scout we had crushed above, but broad, serrated gouges thick as iron spikes.

The scout in the chimney had not been hunting for stray rats. It was an outrider guarding a supply line.

"Master," Lázaro said, his gaze fixed on the bronze pipe. His voice shook, stripped of all apprentice bravado. "The gas isn't leaking into the chimney. Someone piped it in on purpose."

I tightened my grip on the municipal wrench, the heavy iron cold against my calloused palm. Through the solid masonry beneath our boots, the low, steady vibration of the city mains was no longer just a hum. It was a rhythm, pulsing with the heat of an engine being stoked for slaughter.

The rulers of Cadernera were not trying to clear the soot from Casa Trilla. They were feeding the fire that would burn it to the ground.