Chapter 1

Otis had already refused a job on her behalf by the time she got back from the dawn run.

She knew because the tea tin lid was out on the steel bench with a curl of ash in it, and Otis only burned paper he didn't want her to read. He sat at his end of the bench with his own kettle going, the dented copper one he'd carried in from a house clearance two winters back and never taken home, and he didn't look up when she shouldered the door.

"Who was it."

"Nobody you'll miss. Somebody wanted a walk-in at the Census annexe on Spa Road: documents through the front door, past the cameras, signature on entry." He tipped the ash into the bin. "They register couriers now. One signature and you're a line in their ledger for good."

"I price my own risk."

"You price it fine. I get to the post first." He poured her cup before his own: as close as he came to apology. Then he pushed it down the bench. "And that's not tea you've been drinking, by the way. That's leaf punished with boiling water. Let it stand off the heat next time."

She drank it. It was better than hers. His half of the shelf held the copper kettle, a stack of clean slips, three tangerines in a bowl he'd brought from home months ago, and a jar of Petra's picket-kitchen honey with the label half soaked off.

The arch was doing its morning noise: relay rack ticking on standby behind the wall, the VE ceramic tags on the old conduit housing catching light from the loading door. Out on Tooley Street the bakehouse rota was calling shift change, and somebody from the Bermondsey roof plots was arguing about water rights with somebody who had already lost. Mara had been walking a parts satchel to a clockmaker in Rotherhithe since five and her feet knew it. She ran the board's morning diagnostic anyway, node by node; the topology forgave nothing, and she couldn't afford to either.

"There is one worth having," Otis said, when the diagnostic came back green. "Came through last night, two removes up my chain. A friend of a friend wants to know a man is still breathing."

"Welfare or recovery?"

"Welfare. Find him, confirm he's upright, report back. No contact, no approach." He took a slip from his jacket, already folded, and laid it between them. "Somebody called Wren. Relay address seven months cold. Mid-thirties, dark-haired, last touched east of the river. There's a note about a drive he was carrying when he dropped off."

She unfolded it. Sparse: careful writing, by somebody who didn't know who'd read it. Seven months was a long silence; most people who went quiet that long were dead, or so frightened of being found that it came to the same thing.

"Thin," she said.

"It's what there is." Otis took a tangerine from the bowl and set it beside the slip with small formal gravity: payment when the ledger fell short, a fee he'd invented during her apprenticeship. "Whoever's asking, they're asking gently. That tells you something."

It told her the client wanted to look gentle, but she took the tangerine and let him have the point.

The relay map came up under her hands: eleven nodes across south and east London, five years of hardware installed, bribed into place, or inherited from brokers who'd been caught or gone quiet. She'd built it herself, had learned its drift and its moods, until a connection's geography fell out of its imperfections.

She fed the cold address into the Walworth node and rang it.

Six rings. Then a click, and a man's voice, careful: "Hello?"

"Oh, good morning, sorry, is that Micah?" And she was Sol now, patient, fond of people, all the time in the world. "Micah Deane. I'm ringing about the allotment ballot."

"You've got the wrong number."

"Have I? Oh, I probably have." Sol laughed at himself, unbothered. "Third one today. I'm reading off a docket that's been through the rain, the sixes have all gone to eights. You're not a Deane, then."

"No."

"Well, I'm sorry to trouble you." And then, because Sol was built for it: "You haven't had the ballot people round your way, have you? They're meant to be doing the whole east side."

A pause, and Mara measured it. Underneath the deliberate caution in his breathing was the involuntary part, the interval his nervous system added to the circuit before the voice caught up: sixteen milliseconds through Walworth. That was his baseline. He'd given it away by answering.

"I wouldn't know," Wren said. He should have hung up then, but he didn't.

She switched the call to the Bermondsey relay while Sol rambled about the docket, the rain, a sister in Peckham who kept the allotment for her bees. The reroute was silent on his end; the signal took a different physical road, and the new numbers laid against the old began to give her geometry. Thirteen base through Bermondsey. When Sol mentioned that Micah had last been living down by the canal, the thirteen grew a four-millisecond invountary flinch. Wren knew nothing about it.

Camberwell next, while Sol wondered aloud whether the ballot even covered Kingsland. The flinch on Kingsland was sharp enough that she sat forward. East of the river and north of it too, further up than the slip had implied.

She kept him talking. Otis's line, drilled into her years back: It's not about the relays, which any patient broker could plant, but keeping a frightened stranger on the line. Sol asked nothing, needed nothing, offered small useless warmth, and the man stayed. Through Peckham she planted the risky one, Sol grumbling that the ballot wanted Census stamps and who had those any more; the flinch came back so hard it clipped the signal, a partial reading, and the temperature of the call dropped with it. She must have touched a nerve.

"I should let you go," Wren said, wary now.

"Course, course. I've kept you." Sol didn't grab at him. "My eyes are going, that's the truth of it. My sister says I want spectacles and I say I want dockets that don't sit out in the weather." A small tired laugh. "You've been kind. Most people just put the phone down."

The silence was the longest of the call, and Mara sat inside it with her pen still. Seven months since this address had touched the network. He had stayed on a wrong-number call for the better part of forty minutes, with a stranger who wanted nothing from him.

"It's no trouble," Wren said.

She rang the signal through Greenwich while Sol told him about the bees, and the reading came back clean. Then Deptford, the last one she'd risk, and the probe went inside a mishearing: "Sorry, you dropped out just then. You're not over the estate side of the canal, are you? The line always goes on the estate side."

"No," Wren said. One syllable, level. Underneath it, through Deptford, ten milliseconds of flinch, and the triangulation collapsed to a point.

Hertford Road. The terraces backing the old canal, in a district that had failed Census two springs running, where allocation had stopped feeding the people and the streets had gone quiet enough to hear your own footsteps arrive before you did.

"Well," Sol said, warm and finished, "I'll leave you in peace. Mind how you go."

"You too," Wren said, and the address went dark.

Mara took the headset off. Six clean readings and a partial, from seven relays, and she had pinned a man to a street he must have believed no one could see. Her tea had gone cold at her elbow. Otis had moved to the camp bed with his reading and fallen asleep over it, one hand flat on the page.

She picked up the job slip to write the confirmation, and read it again instead.

A small grey field drive. Industrial. High capacity.

She'd gone past it the first time, filed under the ordinary sad inventory of people who run. Industrial-class field drives were allocation-systems hardware; they carried network architecture, operations data, the working guts of the apparatus itself. Not documents. Not the savings slips and transit stamps a frightened man grabs on his way out a door.

Nobody carried infrastructure except someone who had taken a piece of the machine and gone to ground with it. And nobody paid gently, through two removes and a welfare frame, to locate a man like that because they missed him.

A whistleblower. And a client who knew it.

The job had come up Otis's chain, under his name. Whoever stood at the top of it had reached her through the old man asleep ten feet away. He had vetted the ask, called it clean, and paid her in a tangerine. He did not know what he had just handed her, but whatever she did next, he was in the chain.

She struck a match and burned the slip in the tea tin lid, the way he'd taught her, and Hertford Road went where nothing could be subpoenaed or stolen: kept only in her head.

Then she took the tangerine out of her jacket and put it back in the bowl.