The cold in the lower Lantern Chamber was total. Without the violet thrum of the active ward coils, the vault felt like the inside of an ancient granite tomb that had been sunk beneath forty feet of river mud before the kingdom was named. Black slow leak water rose to the laces of Tomas’s cart driver boots, cold enough to turn his toes fully numb. He carried ribbons of yellow clay that swirled lazily around the legs of the bronze cradle.
Aven Lark sat on a three-legged wooden stool he had hauled down from the gatehouse, his greasy glasses pushed up onto his bald forehead, his head bowed between his knees. In his trembling fingers, he held the small brass clockwork tongs he had used for sixty years to repair the gear catch wheels of dock clocks. Beside him on an empty lard tub, twenty-four clean zinc canisters—each lined with oiled lambskin to receive the detached name plates—sat open in two neat rows. It waited for the low-tide window.
Tomas stood beside the sphere, his left arm throbbing with a steady, dull fire inside the damp linen sling. His right hand held the heavy brass chain of an amber animal fat lantern. That kept the flame steady twelve inches from the fractured blue glass of the lower rim. Where the saboteur’s thermic chisel had struck, a three-inch star fracture radiated outward from the copper channel, distorting the etched glyphs beneath like letters seen through the bottom of a cracked beer bottle.
‘I can’t read the third mark, Tomas,’ Aven whispered, his voice cracking with old age and cellar damp. ‘The glass has crazed along the internal prism. If I force the release catch from the outside, the blue glass will shatter into powder. The etched characters will fall into the oil sump below. Three names... Three families... And I can’t tell who they belong to.’
Nessa Vale stepped up to the cradle. She had removed her heavy canvas traveler’s coat, working in her dark wool waistcoat and linen sleeves, her brass sound horn slung behind her neck on its dark leather lanyard. In her hands, she carried her master surveying kit. A four-inch silvered glass mirror mounted on an adjustable brass ball-joint, a pair of fine steel dividers, and a narrow jeweler’s magnifying glass with an amber filter.
She didn’t look at Tomas. She didn’t need to. She pointed her finger at the lower edge of the fracture, then held up three fingers to indicate the three distorted names.
‘Stand on my right, Tomas,’ she commanded in her crisp, steady pace, her eyes fixed on the glass. ‘Hold the lantern at a forty-five-degree angle to the crack. Don’t swing the chain. If the flame flickers, the refraction doubles the shadows on the internal copper plate.’
Tomas braced his shoulder against the cold heart-oak timber of the cradle. He locked his elbow to keep the lantern fully motionless. The heat from the horn glass warmed his knuckles. But his boots remained anchored in the freezing salt water.
Nessa slid the thin silvered mirror through a half-inch upkeep gap beneath the iron mounting ring. With tiny shifts of her brass thumb-screws, she caught the amber lamplight. She reflected a thin, razor-sharp beam of light behind the crazed glass, lighting up the reverse side of the etched bronze slips where the saboteur’s heat had not scorched the metal.
She brought the jeweler’s magnifying glass to her right eye, leaning her forehead within two inches of the cold glass. Her breath came in slow, measured puffs of white vapor that vanished against the frosted metal. For ten full minutes, the only sound in the vault was the slow, steady drip of water from the ceiling vault and the distant, underground thud of the river pressing against the weir gates.
‘First name,’ Nessa whispered, her lips moving with exaggerated clarity so Hester Quill could record the words on her drafting board. ‘Joran Vane. Trade mark: cross-peen hammer and plumb-bob. Mason of the river piers. Date of deposit: three days before the breach.’
‘Where did he want it sent?’ Tomas asked, his voice low.
Nessa adjusted the angle of the silvered mirror by half a degree. ‘His order is specific: To the Bridgewrights’ Chapel in Bellwether. In the keeping niche beside the river altar. If the chapel is gone, to the trade keeper elected by the quarry fraternity. He left three silver crowns in his guild chest to pay for annual animal fat candles for the bridge apprentices.’
Hester Quill’s goose quill gave a sharp, dry scratch as she entered Joran Vane’s name, trade, and destination into the master ledger. She blotted the ink with powdered chalk.
‘Second name,’ Nessa continued, her eye never leaving the magnifying glass. ‘Marta Karr. Trade mark: three curved needles and a flax spool. Seamstress from the low street near the North Water Gate. Order: To my sister Elen, or to the Willow Stair keeper if my sister can’t be found. Note added in the margin: The red wool blanket in the cedar trunk belongs to my sister’s girl. Don’t let the parish court guard sell it for rent.’
Nurse Venn, who had accompanied them into the vault carrying her medical satchel, bowed her head. Her fingers touched the wooden tally fragment hanging from her neck. ‘Marta Karr was my mother’s second cousin,’ Venn said softly. ‘Elen died in the orphan school forty years ago. But the blanket... The blanket was kept in the hospice linen chest until the moths took it ten years back. I will receive the plate for Willow Stair, Tomas. The family is gone, but the name will have a clean shelf in the garden shed.’
Nessa paused. Her hand tightened on the brass ball-joint, her breath catching in her throat. She shifted the mirror another quarter-turn, her magnifying glass pressing hard against the crazed glass.
‘The third one,’ Nessa said, her voice dropping into an uncharacteristic, somber hush. ‘It isn’t a trade mark. It’s a child’s hand. Small... No bigger than four fingers across.’
Tomas leaned closer, his good shoulder aching with the effort of keeping the lantern steady. ‘What does it say, Nessa?’
Nessa swallowed hard before speaking. ‘Name: Davy Moss. Age seven. Son of Bran and Mora Moss of Reed Bank. Order: To be carried on the summer boat, beside my mother’s plate, so I can see the water. Just then, the hay is cut. Beneath the name... Beneath the name is a sentence written in an adult’s hand, signed by Oren Voss. Deposited while the family was moving their barge to the high channel.’
Eren Moss, who was standing at the threshold with his long ash pole, closed his eyes. The old riverman’s jaw worked silently for a moment. His scarred knuckles pressed hard against the rough wood of his staff.
‘Davy was my father’s younger brother,’ Eren said, his voice thick with the gravel of forty years of grief. ‘He was seven when the river took the lower channel. We thought his body was carried to the sea. We never knew... We never knew Oren Voss took his name into the Lantern before the gates went down.’
He opened his eyes, looking directly at Tomas. ‘The summer boat is tied at the wharf right now, Tomas. Its keeping shelf has been empty for thirty-nine years. My mother kept a bowl of dried lavender on it until the day she died. Bring the boy’s plate home. We’ll carry him past the hayfields every summer until the boat rots.’
Tomas looked down at Hester’s master ledger. Across the open pages, seven hundred and thirteen lines were written in dense, dark oak-ink. Every single line now had a name, a date, a maker’s order, and a living destination.
Not one remained an anonymous number.
Not one remained a captive source of power for an illegal engine.
Aven Lark looked at his pocket watch, its gold-plated lid clicking open with a fragile, tinny sound. ‘The tide is turning at the river mouth, Tomas. In twelve hours, the water at the weir will reach its lowest neap. The deep water pressure behind the gate will drop to eight feet for ninety minutes.’
‘That is our window,’ Tomas said. He unhooked the lantern chain, lowered the light to the rim of the tub. Then he turned to the assembled companions. ‘Nessa, check the survey lines on the bypass channel once more. Sile, keep the watchmen on Holt’s townhouse. Don’t let him communicate with the river contractors. Master Lark, set the canisters in numerical order. When the low-tide bell rings tomorrow morning, we uncouple the seven hundred and thirteen.’
He reached down with his right hand, took Davy Moss’s zinc canister. Then he placed it carefully on top of the pile.
‘Nobody stays in the machine,’ Tomas said. ‘Not a hero. Not a child. Everyone comes home.’