The knock came from my right hand.
I stood in the middle of the street, staring at my palm while the last traces of silver light disappeared beneath my skin. For several seconds, I couldn’t feel anything except the ache in my injured shoulder and the unpleasant certainty that something had answered from below because I had answered first.
Nyelle stepped away from me.
It was only half a step, but I noticed.
I couldn’t blame her. Five minutes ago, she had watched something wearing the shape of a child accuse me of being the reason it remained trapped. Now my hand had responded to a knock beneath the city, and her last memory of our mother suggested that whatever had happened when I was born had been more complicated than either of us understood.
Still, seeing her move away hurt more than I expected.
"Nyelle."
She looked up immediately. "I’m here."
"You stepped back."
"I know."
"Are you afraid of me?"
Her lips parted, but she didn’t answer at once. She glanced at my hand, then at the broken building behind us, as if searching for an explanation that would make the question easier to answer.
"I’m afraid of what might happen to you," she said finally. "I don’t know whether that’s the same thing anymore."
It was an honest answer.
I would have preferred a reassuring lie, but I had no right to ask her for one.
The stranger approached us, his attention fixed on my palm. "Don’t touch anything with that hand."
I raised an eyebrow. "A little late for that advice."
"I’m serious."
"So am I. You could have mentioned this before my hand started communicating with things underground."
He ignored the remark and crouched beside a broken section of pavement. Several silver lines had appeared along the exposed concrete, converging beneath the place where I stood. Unlike the patterns we had encountered inside the ancient structure, these lines were thin and incomplete, as though something were drawing them from the other side of the road.
The stranger reached toward one with two fingers.
The line vanished before he touched it.
He withdrew his hand.
"What did you see?" I asked.
"Nothing I can explain yet."
"Try explaining the part you can."
He studied the pavement. "The structures we’ve encountered respond to your presence. This is different. Something beneath us responded to your hand."
"Isn’t that what the other structures have been doing?"
"Not exactly." He stood, brushing dust from his fingers. "Those structures recognize you. Whatever is beneath this street appears to be communicating with you."
I looked down at my palm again.
The distinction was small enough to sound meaningless, yet it left me with a question I didn’t want to ask.
If the structures were recognizing me, what exactly did they think I was?
A faint vibration travelled through the soles of my shoes. I stepped away from the damaged pavement, and the vibration stopped. When I moved closer, it returned, this time accompanied by a dull pressure beneath my palm.
The stranger noticed my movement.
"Don’t experiment with it."
"I moved two steps."
"You were testing the response."
"And now we know it changes with distance."
He stared at me for a moment before looking away. "You learn quickly."
"Usually, learning doesn’t involve the possibility of my hand opening a hole in the world."
"Then consider this a poor environment for experimentation."
That almost made me smile.
Almost.
I took another step backward, and the pressure in my palm faded. Whatever was beneath us had not followed the silver lines toward the building, nor had it attempted to emerge through the pavement. It had answered once, then waited.
That bothered me more than an attack would have.
An attack had a direction. A threat could be avoided, confronted, or understood through the damage it caused. Waiting suggested intention, and intention meant that whatever lived beneath the city might be capable of deciding when to act.
A sharp sound came from the stranger’s pocket.
He pulled out a small device, an old rectangular instrument with a cracked screen and several physical buttons along its side. It looked older than the phone we had been carrying, but the screen flickered with a pale light that hadn’t been there a moment earlier.
"What is that?" I asked.
"Something I brought from the facility."
"You’ve had another device this entire time?"
"It isn’t a phone."
"That’s reassuring."
He pressed one of the buttons.
The screen displayed a simple diagram: three overlapping circles surrounded by thin lines. At the center was a small point of light, pulsing at irregular intervals.
My right hand warmed.
The stranger immediately turned the device away from me.
The light stopped pulsing.
He looked from the screen to my palm, then back again.
"What?" I demanded.
He hesitated before showing me the display.
A new mark had appeared at the center of the three circles. It was shaped like a narrow vertical line crossed by two shorter strokes, almost resembling a person standing with their arms lowered.
I had seen that symbol before.
Not on a wall or a door, but in the fragments of memory Nyelle had described—the white room, the machine, our mother carrying me away from something she had been trying to keep closed.
"Where did you get that?" I asked.
"The facility’s monitoring room. It was recorded before the collapse."
"You said you were outside the chamber."
"I was. I found the device afterward."
"And you didn’t think to show us earlier?"
"I didn’t know it would respond to you."
I held out my uninjured hand. "Give it to me."
He shook his head. "No."
"I’m beginning to notice a pattern."
"Your hand has just answered something underground. This device has reacted to you as well. Until we understand the connection, you shouldn’t handle it."
"Then explain what the symbol means."
"I can’t."
I stared at him.
He corrected himself. "I never found an explanation in the facility records. The symbol appeared on the monitoring equipment shortly before the collapse. Every recording from that period ended at the same moment."
"What moment?"
"The moment the readings changed."
He turned the device toward me again. Beneath the symbol, a line of text had appeared, faint enough that I had to lean closer to read it.
SUBJECT RESPONSE CONFIRMED.
A second line flickered into existence.
EXTERNAL ORIGIN UNRESOLVED.
Then the screen went black.
My right hand stopped aching.
For one brief moment, the silence felt almost peaceful. Then Nyelle caught my sleeve.
"Veyric, look."
She pointed toward the street.
The silver lines had returned, spreading across the pavement from the damaged building toward the far end of the road. They moved slowly, branching around abandoned vehicles and broken pieces of concrete before joining into a single path.
Not toward me.
Toward Nyelle.
She backed away as the nearest line reached her shoes.
The stranger stepped between her and the pavement. "Don’t move."
"I’m not planning to."
The line stopped.
Nyelle shifted her weight, and the silver pattern changed direction, following her movement by several inches. When she stepped left, it adjusted. When she stepped right, it did the same.
I watched the pattern carefully.
It wasn’t chasing her.
It was tracking her.
"Nyelle," I said, "stand still."
She obeyed, though I could see how much effort it took her not to look down again.
I moved toward the line.
It remained fixed on her.
Then I stepped between them.
The silver light divided into two branches. One continued toward Nyelle, while the other curved toward my right hand.
The stranger swore under his breath.
"What does that mean?" Nyelle asked.
He didn’t answer.
I watched the two branches extend across the pavement, their faint light reflecting in the broken windows around us. One led toward my sister. The other responded to something in me, and neither seemed willing to abandon its course.
For the first time, I wondered whether the System’s classification of our connection had been wrong from the beginning.
Perhaps I wasn’t the only one the ancient structures recognized.
Perhaps Nyelle wasn’t simply caught in the consequences of my birth.
A message appeared before my eyes.
[DUAL RESPONSE DETECTED.]
I held my breath as a second line emerged.
[LINKAGE: UNRESOLVED.]
The display vanished.
Nyelle looked at me. "What did it say?"
"Two responses. It doesn’t understand the connection."
"Between us?"
"I think so."
The stranger stared at the silver lines. "We need to leave before the response strengthens."
"Where are we going?" Nyelle asked.
He pointed toward a narrow street beyond the damaged office building. "There was an old transit station several blocks from here. The facility records mentioned a structure beneath it."
I looked at him. "You knew about another structure?"
"I knew there was a record of one. I never found the entrance."
"Of course you didn’t."
"Veyric," Nyelle warned softly.
I exhaled and looked toward the street he had indicated. We needed somewhere safer than an open road, and if the facility records were accurate, the station might offer shelter while we figured out what the silver lines wanted from us.
But I wasn’t going to follow another mysterious pathway without understanding the consequences.
"We go there," I said, "but we’re not opening anything just because it recognizes us."
The stranger nodded.
"And if that device reacts again, you tell us immediately. No more deciding what we can handle."
He hesitated before agreeing.
It wasn’t trust, but it was a beginning.
We started down the street, keeping away from the broken pavement. The silver lines remained behind us for several seconds, stretching between the damaged building and the places where we had stood. Then they slowly withdrew beneath the concrete, leaving no visible trace.
I had almost convinced myself that the response was over when the old device sounded again.
The stranger stopped.
Its screen illuminated his face, displaying a single new message.
He read it silently, and whatever he saw made the color drain from his cheeks.
"What is it?" I asked.
He turned the device toward us.
The message contained only one sentence.
THE SECOND SUBJECT MUST NOT REACH THE STATION.
Nyelle stared at the screen.
"Second subject?" she whispered.
I looked at the stranger. "Which one of us is the first?"
He didn’t answer.
The device vibrated again, and a final line appeared beneath the message.
THE FIRST SUBJECT HAS ALREADY AWAKENED.
My right hand went cold.
Somewhere beneath the city, a knock echoed through the pavement.
This time, it came twice.
Once for me.
Once for Nyelle.