The morning after the full note, Yuna took off her one red mitten.
Until then she had refused to let even a single stitch be unravelled. Her mother had knitted the mitten, and nothing else left in the Soot still held the warmth of her hands. Now Yuna tied it to the pipe by Dara's stove.
"There's a living spark here," the girl said.
Powder from a hundred and nineteen dead forms lay all around them. Three communal stoves had survived, but only one held a small red fire. Irsa answered beneath Marek's collarbone. She could speak, but she had no body with which to enter a pipe, hold a bolt or even show the way.
The people expected Marek to fill all the stoves at once. He did not.
Dara left the surviving spark at her own stove. Thirty grams of ash were measured into Saya's stove, and the same amount went into Beran's. Dara also permitted one new form to be made, but locked the damper for the next cycle with her own key.
Seven minutes later, one spark emerged from each of the three stoves.
With the survivor, that made four.
Marek took no direct lines. Saya sent her listener to the infirmary, and Beran ordered his holder to secure the emergency valve. At Dara's, two carriers moved a single barrel of water: the old spark and the new one worked as a pair, but both answered to the stove-setter.
The district came back to life slowly. A barrel the old network would have delivered in a minute took a quarter of an hour to haul. The listener could check only one passage. The holder helped no one until it had finished with the valve. But not one task passed through Marek.
Dara was the first to make a mistake. She sent both carriers by the shortest route, where a wheel on the old trolley broke. One spark tried to carry on with the task and began dragging the barrel along the ground. The stove-setter stopped that spark alone, ordered the people to transfer the barrel to a sledge, then reopened the line. The second form kept the load balanced throughout. A mistake at one node did not stop the other stoves.
Meanwhile, Saya's listener found a girl in an infirmary pipe who could not make the adults hear her. Saya did not redirect Dara's carriers. She passed the message to the people and waited for the stove-setter to decide whom to send. It took longer than a single order from Marek would have done, but one operator did not take another's place.
The White Bell sounded a test note from the city tower.
Saya's listener lost its bearings for a few moments, Beran's holder tightened its grip but did not release it, and Dara's sparks stopped beside the barrel. The three operators closed their lines separately, waited out the glassy peal and issued their commands again.
Not one form crumbled. The Bell could no longer find a common rhythm to sever with a single stroke.
For the second test, Beran struck the emergency cut-off himself. His holder froze at the valve, while the other three sparks carried on working. Then Saya's stove was shut down. Contact with the infirmary was lost, but the water reached the upper street. When Dara's node was cut off, only the trolley stopped. Three times the district lost part of the network, and not once did it lose everything at once.
The residents recorded the time of every stoppage on the wall. The district went longest without a listener: six minutes with no communication. Dara demanded an ordinary human runner at every future node. Distribution did not do away with reserves. It forced them to name in advance who would replace a spark if it went out.
After that, Yuna asked the residents for red scraps of cloth. Old scarves, sleeves and pieces of blanket were cut into short strips. Cloth tied to a pipe meant that a living person had checked the passage. An upturned lamp warned of salt. Five knocks on metal summoned a listener.
A special knot of two loops was tied in every scrap. Yuna had devised it from the last stitch on her mitten. If the cloth hung without the knot, it could not be trusted, even if the colour looked right.
Three more followed the first trial cycle. The stoves now produced full batches of six sparks. The stove-setters made fifty-seven new forms from one kilogram and seven hundred and ten grams of ash. With the old spark, the network now held fifty-eight.
Marek accepted twelve lines only after the operators themselves assigned him four listeners, four seams and four carriers for the shared route. The other forty-six forms remained at the three local nodes. Any operator could recall their group without asking the Shepherd.
The shared route crossed three boundaries. A red scrap hung at each one, with a local witness standing beside it. If the witness removed the cloth, Marek's direct forms stopped until the next sign. For the first time, the Soot restricted not the number of his sparks but the distance over which he had the right to use them.
By evening the Soot had water again, medical steam and communication between the houses. Everything worked more slowly than before the strike. No one tried to hide that behind fine words.
Saya brought the common ledger of costs. The first page recorded the loss of the smell of Marek's kitchen, the second the loss of his mother's intonation from Saya's memory. On the third, Yuna entered Beran's cost: the memory of a sledgehammer's weight in both hands.
Saya read her own entry aloud.
"I remember the words. She was calling me home. But when I repeat them to myself, I hear a stranger's voice."
For the first time, Marek told her the whole truth about the kitchen. He remembered where the table had stood, how Ella dried the mittens and which floorboard creaked. Only no smell led him home any more.
"If you offer a memory again, you'll first write down exactly what will disappear," Saya said.
"I will."
"Not after the decision. Before it."
Marek agreed.
Beran also put his mark beneath the record of his cost. Without the old feel of the sledgehammer, his metal hand began missing narrow levers. The mechanic did not ask for the key back. He demanded that every new operator spend a week learning to work without relying on the memory placed in the stove. Only then could a stove earn the right to a permanent node.
The open ledger did not make the loss any smaller. It kept them from calling it unexpected.
The first false signal was found on the northern branch line before sunset.
A red scrap hung beside a dry pipe, marking a safe route. The two-loop knot was there. But the cloth moved against the flow of air: smoke drew towards the exit, while the scrap slowly pointed deeper into the tunnel.
Yuna would not let the listener touch it.
"That isn't our cloth," she said.
The scrap was made of red light. The memory storm had seen the human signal, copied the colour and even reproduced the knot. The one thing it did not know was why Yuna tied it to the pipe.
Five soft knocks came from round the bend.
Marek recognised the rhythm of the cracked kettle.
Then Ella called from the darkness.
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