The brass arch rested against the dark rock pier of Sub-Cellar 4, its four-foot frame tilted three degrees off the weighted drop-line.
Pella Rook knelt in the pool of stale slow leak, Hal’s measuring tongs resting in her lap. The cold smell of wet stonework and decaying river reeds hung thick in the vault. Up on the gravel ramp, the iron scrape of Eren’s heavy cart had faded toward the outer water gate. He had gone to borrow two draught mules from the flour mill to haul the second transport cage up to street level. That left her with the animal fat lantern and thirty paces of dark, stuffy vaulting.
She had wiped the lower doorstep of the arch with a scrap of dry hemp. In the quiet, the water clock of the ceiling ribs continued its slow drip. But where the brass met the damp dark rock, the air had begun to change.
It wasn’t a cold draft from the river bluffs. It was a faint, trembling heat. It was dry and thin, smelling faintly of scorched rubber and hot, machine-pressed steel. Inside the four-foot opening, the darkness between the frame posts began to waver, shimmering like kerosene vapor rising from an unlit stove.
Pella reached for the bronze invocation rod she had set beside the lantern. Her palms were slick with sweat and gray pipe lime. She had watched three dozen summonings in the Great Tiered hall, and in every one, the opening of a threshold was with the stench of burning sulfur, the shriek of displaced air, and the violent surge of an astral entity hurling itself against the silver wire.
Here, there was no shriek. There was no sulfur.
Through the shimmering kerosene haze inside the brass arch came the distinct, metal scrape of a spoon against plastic.
Pella froze, her fingers tightening around the cold bronze rod.
A voice broke through the opening. It wasn’t the hollow, booming rhythm of a river demon or the shrill whistle of a marsh sprite. It was a woman’s voice. It was dry, gravelly, and flat with the fatigue of someone who had been on her feet since dawn.
“If that’s Terry and the lads from Unit 6 messing about with an unshielded walkie-talkie,” the voice said, echoing sharply from the brass header, “you’re on commercial frequencies, mate. Turn the bloody squelch down. I’ve forty minutes for lunch and I don’t need two-stroke exhaust through my heater vent.”
Pella’s breath caught in her throat. She stared at the pale oval of light glowing between the brass posts. The voice came from the air itself, clear as if the speaker were sitting behind the next pile of broken slate.
“Who calls?” Pella whispered, her voice trembling slightly before she caught herself. “Who speaks through the open circuit?”
A long pause hung in the vault.
Inside the cab of the Ford Transit in Harrowby, Ada Morland stopped with her plastic soup spoon three inches from her mouth.
She lowered the spoon, set the green thermos cap on the dashboard. Then she leaned over the handbrake to stare into the passenger footwell. The pale oval of milky light behind the old three-inch gate valve was trembling. It shook in direct sympathy with the words. The voice coming out of the metal was young, female. Then he carried a strange, heavy lilt. It was like an Irish girl who had grown up talking to coal bargemen.
“Right,” Ada said aloud, squinting into the dark footwell. “Very funny, Terry. Did you hide an intercom behind my screenwash bottle while I was in the boiler room? Because if you broke the clips on that plastic trim, you’re paying for the replacement from Ford.”
“I know no Terry,” the voice replied from the footwell, sounding small and distant, as if shouted up a dry well. “I’m Pella, daughter of Hal Rook, formerly of the Summoners’ College of Lathmere. Are you a spirit of the upper rock or the dry gravel?”
Ada rubbed her thumb against the scar on her knuckles. She picked up her check torch, clicked the beam on, and shone it directly into the oval. The light vanished into the milky shimmer, lighting up nothing but a hazy expanse of what looked like rough-hewn stone and the glint of black water.
“A spirit?” Ada repeated, her voice dripping with dry Yorkshire skepticism. “Do I sound like a bloody spirit? I’m Ada Morland. I’m a registered heating engineer sitting in a commercial trading estate in West Yorkshire eating leek soup in the rain. What are you playing at?”
In Sub-Cellar 4, Pella lowered the bronze invocation rod an inch.
She didn’t know what “Yorkshire” was. She had never heard the word “commercial,” nor did she understand what kind of vessel an “estate” might be. But the word soup was clear. Through the brass arch drifted an aroma that was entirely foreign to the academy vaults. The pungent, sweet smell of simmered leeks, black pepper. The warm, crusty scent of toasted sourdough crust. It cut through the cold silt stench of the cellar like a wood fire on a frozen wharf.
“You’re eating leek soup?” Pella asked, leaning closer to the brass frame. Her cowhide boots splashed in the shallow slow leak. “Where is your fire? There’s no chimney draft through this stone.”
“I’m eating it out of an empty pocket flask, love, and washing it down with boiled tea,” Ada said, her voice crackling slightly through the opening. “Keeps it hot for eight hours without a flame. Where the hell are you? It sounds like you’re standing in a sewer.”
“I’m in Sub-Cellar 4,” Pella said. “Beneath the west curtain wall of the Summoners’ College. The floor is three feet above the river bluffs. There’s three inches of cold pool water over the flat stone slabs. The ceiling is weeping sulfur salt water.”
“Three inches of standing water?” Ada’s tone shifted instantly from annoyed skepticism to the sharp, automatic alertness of a checker on an unfamiliar site. “Hold on. Have you got electricity down there?”
Pella blinked, the unfamiliar word sliding off her ears. “Elec... Tricity? What’s that?”
“Power,” Ada said impatiently. “Mains supply. Cables. Have you got live wires running through that water?”
“We have animal fat candles,” Pella said. She gestured with her free hand toward the guttering iron lantern on the stone pier. “And an iron lamp burning mutton grease. There are no wires.”
“Right. Well, that’s one blessing,” Ada muttered. Through the opening came the sound of a plastic lid being screwed tight. It was followed by a heavy rustle of waterproof nylon as Ada shifted her weight on the vinyl van seat. “Though God knows why anyone’s making an apprentice wade through stale water with an open flame. Have you got a sump pump running? Where’s the water coming from?”
“It comes through the foundation joints,” Pella explained. She knelt lower so her face was level with the brass opening. “The Gray Rush is in spring thaw. The snowmelt fills the river gravel, and the head presses against the lower stone courses. It has cried like this for forty winters.”
“Forty winters?” Ada gave a short, fed up snort. “Then your foundation mortar is washed out to sea by now. If you’ve got three inches of water on the floor, your drains are either choked with silt or you’ve got no fall on the discharge line.”
“The discharge line was sealed when they built the Sluice Crown,” Pella said.
Through the arch, Ada went silent for a moment.
In the van cab, Ada was no longer looking at Ben’s college application forms. She had pulled her knees up, resting her forearms on the steering wheel, her head tilted toward the passenger footwell.
Plumbing was ninety percent acoustics. A bad fitter looked at a leaking joint and saw only the wet pipe. An experienced heating engineer closed her eyes and listened to the system breathe. The sound coming through the pale oval was not just the girl’s voice and the splash of her boots.
Behind the girl’s words, traveling through the stone and echoing into the van, was a rhythmic, underground thrum.
Clack... Whoosh. Clack... Whoosh.
It repeated every six seconds, precise as a metronome. At first, Ada had taken it for the distant rumble of the railway line that ran past the edge of the Harrowby trading estate. But the hum was wrong. A train had the rolling, clattering rhythm of steel wheels on jointed rails. This was the clear, heavy shudder of a positive-shifted weight high-pressure ram cycling against a closed line.
And behind that pulse, buried in the low frequencies of the stone vault, was a thin, high-pitched hiss that made the hair on the back of Ada’s neck prickle.
Sssssssss-chhhhh.
“Pella,” Ada said, her voice cutting through the van cab, flat, hard, and devoid of banter.
“Yes?”
“Shut up for five seconds,” Ada said. “Don’t move your boots. Don’t splash.”
In Sub-Cellar 4, Pella froze. The total power in the older woman’s voice was different from Master Sorell’s autocratic sneer. It was the quiet, urgent command her father had used when an oar-pin cracked in mid-current.
Pella held her breath. The only sound was the drip from the ceiling and the cold lap of water against her boot soles.
Then she heard what the woman in the dry place was listening to.
It was coming from the rear wall of the third bay. The bowed stonework behind the collapsed slate rack where she had uncovered the brass arch.
The dark rock blocks were not just weeping cold river slow leak. Four feet above the floor, where a level mortar seam ran between two massive granite headers, a tiny thread of white steam was curling into the cold air.
Sssssssss.
“You’re hearing it, aren’t you?” Ada’s voice came through the arch, sharp as a cold chisel.
“There’s... A white vapor coming from the mortar joint,” Pella said, her eyes tracking the thread of steam. “It smells of pipe lime and boiled river mud.”
“That’s not vapor, love,” Ada said, her words coming fast and clipped. “That’s high-pressure discharge. You’ve got an unvented main behind that stonework, and the packing on the sleeve has failed. How thick is that stone wall?”
“Three feet of granite cut stone backed with river rubble,” Pella said.
“Then you’ve got about three minutes before the deep water pressure blows the pointing clean out of the wall,” Ada said. “Listen to that bubbling blast. Ch-ch-ch-whistle. The water behind that stone isn’t cold river run-off. It’s boiling, or near enough to flash to steam the second the pressure drops. If that joint lets go, three feet of granite won’t stop it. It’ll throw those stone blocks across your cellar like gravel out of a shovel.”
Pella felt a cold shock travel down her spine, chilling the sweat on her neck. “The whole cellar will flood?”
“It won’t just flood, girl. It’ll scald you to the bone before you reach the ramp,” Ada snapped. “Is there a solitude valve? A stop-cock? An iron wheel on a pipe anywhere near that bay?”
“I don’t know,” Pella said, looking wildly at the dark corners of the vault. “The academy clerks don’t keep drawings of the sub-cellar pipes. They say the water is governed by the Curators’ seals.”
“Curators be damned,” Ada’s voice barked through the brass arch. “Water doesn’t read Latin, and it doesn’t give a damn about seals. Grab your lantern and get over to that wall. We’re finding that valve before that stone lets go.”