The relay office smelled of scorched reed and old wax, and the clerk at the long bench did not look up when Nessar the Hinn came in.
It was a low room cut into the side of a channel where three tribal roads met, one of hundreds like it. Messages came in at one end as knotted cords and pressed tablets and plain speech, and went out at the other end by one of two passages, left or right, both of which reached the same places in the end. Which one a clerk chose depended on the hour, on the weight of the traffic, on habit. On the wall above the bench hung the cords of the week's dead letters, the ones no one had claimed, knotted at the top and swaying a little in the draught from the passages. A brazier ticked in the corner. Someone had left a bowl of dates on the sill and nobody had eaten them. Nobody had ever audited which door a clerk chose. Nessar had spent eighty years making sure nobody would.
He put his notice on the bench. It was the kind minor faction leaders filed after every gathering, a line to say he had attended and a line to say he had left, and in which hand he had written it. The clerk weighed it on her palm without reading it and dropped it in the right-hand basket.
Behind her a younger clerk was sorting a pile of cords. He had a burn scar across the back of one hand and a habit of humming through his teeth. He picked up a routine message from the western benches, a request for water rights, nothing, and looked at both doorways, and sent it left.
Nessar watched him do it and felt nothing move in the room. The cord swung once in the left-hand doorway and was gone.
The young clerk was a watcher. Nessar had never met him and did not know his name. Some jinn Nessar had placed nearly a century ago had trained someone, who had trained someone else, and somewhere down that chain a boy with a burned hand had learned that if he saw a certain minor faction leader leave a gathering early by a side passage, then the next day he sent his first routine message left instead of right.
One clerk choosing left was noise. Routing drifted all the time. But at that hour, across the tribes' whole web of channels, about two hundred jinn who had seen the same thing at the gathering were making the same small choice in offices and crossings and message houses Nessar would never visit. Laid side by side, the choices made a pattern, and the cells had been trained for years to read it.
It said begin.
He had sent nothing. He had only gone to the gathering, left it the way he left it, and come here to file a notice he had filed a hundred times before.
He did not know the cells. That work he had put in other hands, jinn he had tested early for durability and then stepped away from. He did not know how many cells there were. A count needs a record, and one traitor with a record can sink everything. He knew a range, and inside that range the real figure rose and fell as cells formed and worked and broke apart on their own. No cell knew another. Between any two he had put six go-betweens, and nobody walks a six-step road by accident. A broken cell could give up only itself.
The older clerk was talking to the younger one without turning round.
"They say Soren has the registry readers working through the night," she said. "Pulling every pact with the same pattern as the dead boy's. Matching each sorcerer to one jinn who knows his habits. Hundreds, they're saying. My cousin's husband has been asked to wait at home for a summons."
The young clerk went on humming through his teeth. He tied off a cord and reached for the next.
Nessar picked up a blank tablet from the stack by the door, as if he had forgotten something. The wax was still soft at one corner.
Soren's inner life interested him less than what Soren's purge would do to the jinn world's attention, and that was easy to see from this bench. For as long as the purge ran, every office like this one would talk about sorcerers dying: which ones, how far the void spread, which tribes objected, whose cousin had been chosen to do it. Nobody would be watching the edges of the human world, where his cells were choosing.
Attention was finite. Soren had just pointed all of it somewhere else.
Nessar had not counted on that. The network had been built to work under close watch. A jinn world looking the other way meant the window he had already judged wide enough was wider, and he would use the width without pretending he had earned it.
He wrote a second notice on the blank tablet. It said the same as the first, but he pressed it in the formal script instead of the common one. Somewhere a watcher who saw formal script from him, this week, would shift one value by a few days: how soon the cells moved from watching their targets to entering them. It would travel the same road the begin had travelled, and every cell would take it up without knowing anything had changed. Entering meant a crossing. Gates kept records and his cells kept none, so they went up through the unguarded places, the open sea and the deep sand, and he had counted in the ones who would not arrive. A cell that reached its host would not need to come back down. The host would feed it.
He handed the tablet to the older clerk. She frowned at the script.
"You already filed," she said.
"I spelled my tribe wrong."
She looked at it, shrugged, and dropped it in the left-hand basket. It was the only order he gave that week.
His second came to the Sanctuary four nights later, at the hour agreed, and stopped one pace inside the doorway.
Nessar sat against the left-hand wall, knees up. He had made sure of it before the second came. At the back of the room, behind a curtain of plain hide, was the alcove where he kept his own notes, the only writing in the Sanctuary. No cell had ever seen them. He had cut the alcove narrower than his shoulders, so that to read there he had to turn sideways, and he had never asked himself why.
"The first class is out across the whole spread," the second said. "Watching. Most cells have not chosen yet. A few have. The possessions have started, earlier than the old timing."
"I moved the timing."
"I guessed. They went in all at once, like water finding a slope."
"And the tribes?"
"Talking about nothing but the purge. Soren's readers have their list. The first sorcerers will be closed within days."
The report was what Nessar had designed it to be, a summary of summaries, each layer kept by a different jinn, with no single cell in it and no single target. He had built suspicion into himself as a discipline in the chamber where he was held, and this was what it bought: a report that could not hang anyone.
The second had his hands in front of him again, one closed over the other.
"What are you holding?"
The second hesitated, then opened his hands. A length of plain grey cord lay across his palm, the kind the relay offices use for messages, and three knots had been tied in it, close together near one end, pulled tight.
"A boy walking home from school, in a port city," he said. "A girl of nine, in the south. A boy who still sleeps in his mother's bed." His voice stayed level. "I hear them from the go-betweens. Nobody tells me. I hear."
Nessar looked at the cord. A record. Three knots, in a room he had built so that nothing in it would ever be written down. His own hands had gone flat on his knees. He felt the cold of the floor come up through them, and under it, very faint, the old pressure of a circle he could not cross.
"Burn it," he said.
"Then I tie another." The second did not raise his voice. "I can tie one in the dark. I have been practising."
"Who has seen it?"
"You."
They looked at each other across the bare middle of the floor. Nessar had chosen this one for his patience. He saw now what the patience had been for: a jinn who could carry a thing for years without letting anyone know he carried it.
The second closed his hand over it again. The knots disappeared inside his fist.
"It is long," he said. "There is room."