The mud on the Lowbank boat ramp didn’t cool when the river slapped against the lower timber wooden support posts. Instead, it cooked. A grayish-white paste of boiled silt, crushed river-mussel shells, and yellow sulfur frothed between the granite cobbles, burbling in greasy bubbles that popped with the dry snap of wet kindling on an open hearth. The stench caught Pella Rook low in the throat as she stepped down from the kitchen porch. A bitter mixture of old river rot, scalding pipe lime, and the vinegar-sharp tang of dark oak-ink that had drifted down the gutters from the town archives three terraces above.
She carried two ash-wood push-brooms and an iron coal scoop she had dragged out of Sister Merrow’s washhouse back kitchen. Her bottle-green wool tunic was already darkened at the cuffs with cold grease, the college apprentice crest unpicked three days ago. That left only a ghost-patch of pale, un-sunned threads over her left breast. She paused at the bottom of the landing steps. That let the iron scoop rest on the stones. Meanwhile, she adjusted the leather strap of her tool apron. In the front pocket, the brass measuring tongs clinked against her flat bronze stop bell. It was five minutes past six in the morning. The bells of the High Sluice Crown had not rung their third-quarter tide warning. The silence from the upper terraces was not peaceful. It was negligent.
Across the alley, Old Orin was dragging an overturned cabbage crate away from his cellar door, swearing in a dry, hoarse wheeze. His leather boots were caked to the ankles in the steaming froth. ‘Pella! Pella girl, look at this sludge! It’s boiling right up through the floor flags! My turnips are stewing in the bins, and the cellar beams are sweating like pigs before slaughter!’
‘Don’t step into the gray puddles, Orin,’ Pella called out, her voice level, kept low so as not to stir the nervous knots of tenement tenants clustering under the overhangs of St. Jude’s Reach. ‘That isn’t river slow leak. River water is fifty degrees colder. It’s blow-off from the high drain tube. If you get that paste on your bare skin, it will blister through the outer skin before you can reach a rain barrel. Go back inside and sprinkle dry peat moss along your doorstep. Don’t touch the cellar floor with your bare hands.’
She knelt, setting down her brooms, and produced her wooden grease pencil. She made a thick black mark across the cobbles three inches ahead of the advancing sludge tongue. Beside it, she laid her check rule. The gray froth was creeping southward toward the ferry boat ramp at roughly two inches every ten minutes, moving along the natural depression where the old cart ruts had worn down the crown of the street. A dozen doors down, two laundresses were shouting at a carter whose mule refused to cross the steaming stone floor, the animal’s nostrils flaring wide, ears pinned flat against its skull as it caught the rotten-egg stink.
Eren Tal emerged from the wheelwright yard with a long iron pry-bar across his shoulder and a wooden bucket of crushed river sand. His thick canvas trousers were tucked into heavy bull-hide boots with brass eyelets, the leather stiffened by years of linseed oil and damp sawdust. He stopped two paces behind Pella, squinting through the morning mist at the milky plume rising from the center of the boat ramp.
‘No city watch,’ Eren said. It wasn’t a question. He spat into the gutter, the spit sizzling faintly where it struck a warm flat stone slab. ‘The high bells rang the morning watch change twenty minutes ago. You’d think even the junior court guards on the middle terrace would notice fifty yards of Lowbank street turning into a porridge pot.’
‘They know,’ Pella replied quietly, without looking up from her measuring tongs. ‘The court guards take their coffee at the Crown Gate tavern. The Crown Gate sits eighty feet higher on the granite ledge. From up there, this looks like river mist. And even if they smell the lime, they’ve been told the drain tube is running its standard seasonal flush. Master Sorell doesn’t call an emergency when Lowbank gets soaked. He calls it routine discharge.’
‘Routine discharge doesn’t crack two-foot foundation stones,’ Eren grunted. He dropped his bucket of sand with a heavy thud. ‘Orin’s cellar isn’t the only one. The turning basin behind my timber shed has two feet of hot water backing up against the water gate gates. The oak planks in the floor are bowing. If we don’t open a trench to the low channel, the whole lower slip is going to float off its wooden support posts like an unmoored barge.’
Pella stood and walked toward the center of the steam plume. The heat hit her face in a sudden, humid gust. It carried the faint, clear stone tang that Ada Morland had identified two days prior. The dry, chalky bitter-salt trace of heated hard pipe-crust. In her pocket, the Courtesy Bridge slate felt warm against her hip. She drew it out, resting the lower iron frame on her forearm as the small etched letters formed behind the cloudy crystal cover.
‘Forty-two PSI,’ Pella murmured, pointing the tip of her grease pencil at the third line. ‘The old lead under-road drains under the boat ramp were rated for twenty-five when my father worked the ferry cables fourteen years ago. They’re running nearly double the pressure. Every joint between here and the old ferry arch is weeping.’
‘Then we shovel,’ Eren said. He didn’t waste breath on outrage. In Lowbank, anger was like coal—too expensive to burn without a pot on the fire. He took the iron scoop from Pella’s hands, jammed the blade beneath a crust of boiling silt. Then he levered it up with a wet, sucking gasp of trapped steam. He flung the heap into his sand bucket, right away smothering it with a double scoop of dry river sand. The steam hissed, died down to a thin, harmless thread, and settled.
For the next forty minutes, they worked in the rhythmic, brutal quiet of manual labor. Pella used the stiff birch broom to sweep the cooling sludge away from the tenement sills into the central cart run. There, the slope dragged it toward the open river. Her arms burned with the steady ache that comes from pushing heavy, waterlogged muck. Her breath rasped against the lime-dusted air, and twice she had to stop to wipe sweat and rotten-egg grit from her eyelashes with the back of her wrist.
Sister Merrow came down the landing steps at seven. She carried a battered tin kettle and four thick pottery mugs nested in an apron fold. Her limp was pronounced this morning—the damp air always tightened her left knee where an old battlefield crossbow quarrel had taken the joint padding—but she walked with the steady, unrushed balance of someone who had seen three field hospitals flooded in the mountain wars.
‘Drink this,’ Merrow commanded. She set the kettle on an upturned stone that wasn’t hot enough to scorch the tin. ‘Bitter chicory and boiled mint. Rinse your mouths first. Don’t swallow the lime dust sitting on your lips.’
Pella took the mug with gray-stained fingers, blowing the steam away before taking a sip. The chicory was harsh and astringent, cutting through the animal fat-like coating on her tongue. ‘Did the clinic cellar take any water, Sister?’
‘Two inches in the coal hole,’ Merrow said, her flat, dark eyes sweeping the street. ‘Nothing the sump pump can’t handle if Tavi keeps his back into it. The boy wanted to bring down salt to melt the sludge. I clipped his ear and told him salt would only pickle the stone and rot the mortar faster. What’s making that kettle whistle underground, girl?’
Pella looked toward the river. Out on the water, the gray morning chop was speckled with white foam. But the current was sluggish, fighting the swollen tide. ‘The College is drawing high-volume headrace flow from the Gray Rush,’ Pella explained, her thumb tracing the rim of her mug. ‘Master Sorell’s crystal engine needs nonstop cooling to run its binding torcs. He isn’t returning the cooling water through the upper canal because the town monitors would log the heat spike. So he’s dumping it through the bypass—right into the old colonial brick sewer system that sits behind our larder.’
‘The sewer that Hal helped seal?’ Merrow asked, her voice dropping lower, gravelly and hard.
‘The same,’ Pella said. ‘Only he didn’t seal it to be an exhaust pipe. He sealed it because the river mud had already softened the foundation arches forty years ago.’
Eren had stopped shoveling. He was kneeling twenty yards up the slope, near the rear wall of the ferry company’s shuttered coal shed. His pry-bar was wedged deep between two massive granite curbs, his head tilted sideways as he pressed his right ear directly against the cold iron of the bar.
‘Pella,’ Eren called, his voice tight, stripped of its usual wheelwright drawl. ‘Leave the chicory. Bring the lamp.’
Pella set down her mug and hurried over the steaming cobbles, Merrow following with the heavy, uneven step of her scarred knee. Eren hadn’t moved. His knuckles were white against the iron bar. Through the gap where he had levered up the curbstone, a faint, rhythmic shaking shook the air. A deep, hollow thrum-thrum that sounded like the heartbeat of an iron bull trapped in a stone water tank.
‘Look down through the bed gravel,’ Eren whispered, pointing with the tip of his boot.
Pella knelt on the damp cobbles, heedless of the gray grit staining her wool trousers. She peered into the jagged fissure. Beneath the road bed, the soil had washed away fully, scooped out by a torrent of hot water. Through the void, twelve feet down in the darkness, she saw the curved crown of an ancient red-brick barrel vault. A hairline crack ran along the mortar line, bright yellow steam whistling through the gap in sharp, rhythmic pulses.
The crack didn’t stop at the edge of the street. It ran straight as an arrow, cutting under the foundations of the coal shed, driving directly toward the blind rear wall of Sister Merrow’s kitchen larder and the deep storage gallery behind it.
‘That isn’t a street under-road drain,’ Eren said, his voice flat with realization. ‘That’s the high gallery arch. The one your father boarded up with seasoned oak balks. The steam isn’t coming from the street, Pella. It’s coming from inside the hill.’