We didn't stop running for three blocks.
Riven moved through the city like he'd memorized every alley, every gap between buildings, every turn that looked like a dead end but wasn't. I followed the sound of his boots and tried not to think about what was behind us.
We ducked into a passage so narrow my shoulders brushed both walls. Through a door that opened into a courtyard. Across the courtyard, through another door, down a set of stairs that went below street level.
Then Riven stopped.
We were in a low corridor. Bare stone, no torches, the only light coming from a faint blue glow that seemed to come from the walls themselves. The air was cooler down here and tasted different — less smoke, more earth, something mineral underneath.
I put my hands on my knees and caught my breath.
"Where are we?" I asked.
"First layer," Riven said. He wasn't breathing hard. Nine years in this city had apparently done things to his stamina. "Shadow Tunnels. Below the Wrath District."
I straightened and looked around properly. The corridor stretched in both directions, curving out of sight. Along the walls, at irregular intervals, were marks scratched into the stone — symbols I didn't recognize, arrows pointing in different directions, numbers.
"People use these tunnels?"
"Constantly. The gangs, the smugglers, anyone who needs to move through the city without being seen." He started walking, choosing a direction without hesitation. "They've been here longer than most of the buildings above us."
I followed. "How far do they go?"
"First layer runs under the whole city. Second layer goes deeper — that's where the old city is. Third layer—" He paused. "Third layer most people don't come back from."
"You've been down there?"
"Second layer, yes. Third, no." He glanced back. "And I've been in this city nine years and I'm still alive, which should tell you something about my decision-making."
We walked in silence for a moment. The blue glow in the walls pulsed slowly, rhythmically, like breathing.
"What is that light?" I asked.
"Sin energy. It bleeds into the stone down here. Has been for centuries." He ran a hand along the wall briefly, not quite touching. "The whole city sits on top of a network of it. Like roots under a tree."
I thought about what I'd felt during the assessment. The hum. The sin network running under everything.
And the small silence where the Void was.
"The assessor sent a signal," I said. "To who?"
"The Lords, most likely. Or their representatives." He turned at an intersection, choosing left. "When an assessment instrument fails completely, it's supposed to mean the person being assessed has no sin energy at all. A null reading. It happens occasionally — some people just don't have it."
"But mine wasn't a null reading."
"No. Your instruments didn't fail because there was nothing. They failed because there was something they couldn't measure." He paused at a section of wall, examined a mark scratched there, continued walking. "There's a difference. Anyone sensitive enough will be able to feel that difference."
"Are the Lords sensitive enough?"
"Every single one of them."
I thought about seven pairs of eyes turning toward the same direction. The image from last night felt suddenly less abstract.
"So they know something unusual was assessed in the Iron Mark this morning."
"They know something. They don't know what yet." He stopped in front of a door set into the tunnel wall. Old wood, iron hinges, a lock that looked like it had been broken and replaced multiple times. "They'll have someone pull the assessor's written record. Your name is on it."
"Aren. No family name."
"In this city, that's common enough not to narrow it down much." He produced a key and opened the door. "But the mark on your wrist is not common. If anyone sees it who knows what they're looking at—"
He stopped.
Pushed the door open wider.
Inside was a room. Bigger than I expected, carved out of the stone below street level. Shelves along every wall, loaded with boxes and crates and things wrapped in cloth. A table in the center with a lantern on it, currently unlit. And sitting at the table, completely at ease, was a young woman I had never seen before.
She had dark eyes and darker hair pulled back from her face, and she was eating an apple with the relaxed attitude of someone who had been waiting for a while and had made peace with it.
She looked at Riven.
"You're late," she said.
"I wasn't aware we had an appointment, Lyra."
"We didn't." She looked at me. "Is this him?"
"This is Aren." Riven closed the door behind us and locked it. "Aren, this is Lyra. She works for the Golden Hand."
"I work adjacent to the Golden Hand," Lyra said, with the tone of someone correcting a long-standing inaccuracy. "There's a difference." She finished the apple and set the core on the table. "He broke three assessment instruments this morning. Word travels fast down here."
I looked at Riven. "You said maybe ten minutes before someone came looking."
"I said someone would come looking for whoever broke the instruments. I didn't say Lyra would be one of them." He sat down. "Lyra collects information. It's what she does."
"It's what I sell," she said. "Which is different." She tilted her head at me. "So. Void energy."
The way she said it wasn't a question.
"How do you know that?" I asked.
"Because I was in the Iron Mark this morning. Three people ahead of you in the queue." She tapped the mark on her own wrist — a slim shape I couldn't read from where I stood. "I felt the silence when your assessment happened. Everyone in the room with any sensitivity felt it." She looked at my wrist. "And that mark is not anything in the standard classification system. I've memorized the standard classification system."
"Why?" I asked.
"Because information about rare things is worth more than information about common things." She looked at me with those dark, assessing eyes. "Void energy hasn't been recorded in this city in over a hundred years. The last person who had it died under circumstances that were officially listed as unknown and unofficially listed as Lord-sanctioned execution." She paused. "The one before that also died. Different Lord, same outcome."
"Riven told me."
"Good. Then you understand your situation." She leaned back. "What I want to know is why you're here. In the city. Specifically."
"My brother."
"Name?"
"Kael."
Her expression didn't change but something behind her eyes did. "Kael," she repeated, in the same tone Riven had used. That same careful repetition, like the name was something that required handling.
"Both of you do that," I said. "Say his name like that."
"Like what?" Lyra asked.
"Like it means something you're not telling me."
Silence in the underground room. The lantern was unlit but I could see well enough by the blue glow bleeding through the stone walls. Lyra looked at Riven. Something passed between them that I wasn't part of.
"Tell him," Riven said.
Lyra picked up the apple core, looked at it, set it back down. "Your brother arrived in this city fourteen months ago. He came in without resources, without contacts, same as you." She paused. "Unlike you, he didn't accidentally announce himself to every Lord in the city on his first day."
"How did he get ranked?"
"Wrath sin. Mid-level. He tested as Ember." She paused again. "That was fourteen months ago. Eight months ago, he tested again. Flame." Another pause. "Three months ago, someone tried to add him to the Iron Mark's records as Inferno. The assessor refused because an Inferno ranking requires a Lord's countersignature, and no Lord would put their name on his file."
"Why not?"
"Because by that point, your brother was not someone the Lords wanted to officially acknowledge." She met my eyes. "He'd been asking questions. About the city's history. About the Wardens. About the Black Archive." She picked up the apple core again, seemed to realize she kept doing it, and put it in her pocket. "About Void energy."
The underground room felt smaller.
"He was looking for me," I said.
"Or looking for what you carry," Riven said. Not unkindly.
"What's the difference?"
Neither of them answered immediately.
"Three weeks ago," Lyra said, "your brother walked into the territory of the Blood Arena Clan, killed four of their fighters in under a minute, walked out, and disappeared." She looked at me. "No one has seen him since. Not publicly."
"Not publicly."
"There are rumors." She chose her words carefully. "That he was taken into the Black Palace. That one of the Lords — no one agrees which one — has him under some kind of arrangement. Not prisoner, not ally. Something in between."
"An arrangement for what?"
"No one knows." She stood. "Or if they know, they're not selling." She moved to one of the shelves along the wall and came back with something small — a folded piece of paper. She set it on the table in front of me. "Except this was left at one of my dead-drop locations six days ago."
I looked at it.
"By who?"
"Anonymous. Which in this city means someone who knew exactly where my dead-drop was and didn't want me to know they knew." She nodded at the paper. "Open it."
I unfolded it.
Inside was a single sentence, written in handwriting I recognized immediately. I'd grown up watching that handwriting on shared notes, on carved wood, on the one letter he'd sent in the first year before the letters stopped.
Don't come to the palace. The city chose you for a reason and it's not a good one.
I read it three times.
"He knows I'm here," I said.
"He knew you were coming," Riven said. "Or suspected. That was written six days ago and you only arrived yesterday."
"He knew because—" I stopped. Thought about what Lyra had said. About Kael researching Void energy. About the city choosing me. "He knows what I carry."
"He's been researching it for at least six months," Riven said. "Probably longer."
"Why would the city choose me?" I asked.
"That's a complicated question," Lyra said.
"Give me a simple answer."
She looked at me for a long moment.
"The city is a prison," she said. "It was built to contain sin energy, to keep it from spreading into the outside world. The Wardens who built it are gone. The Lords maintain the containment — not because they want to, but because the sin network forces them to. They're as trapped as everyone else." She paused. "The prison needs a warden. It's been looking for one for a very long time."
"And it thinks I'm a candidate."
"It thinks you're the candidate." She sat back down. "Void energy doesn't add to the sin network. It absorbs it. Controls it. The city has been pulling people with Void potential toward itself for centuries, waiting for one strong enough to actually do the job."
"What job?"
"Contain everything." She gestured at the walls, the ceiling, the city above us. "All of it. Permanently. One person, Void energy strong enough to absorb the entire sin network, and the prison seals itself. The Lords, the gangs, the monsters, the sins — all contained. Forever."
The lantern on the table between us was still unlit.
But in the walls, the blue glow pulsed.
Steady and patient.
Like something that had been waiting a very long time and had just heard footsteps approaching.
"And what happens to the warden?" I asked.
Lyra and Riven looked at each other.
Neither of them answered.
Which was, I was learning, how this city gave you the answers you didn't want to hear.