The cord tapped against the glass again.
Two soft clicks, a pause, then three more.
Rayleigh didn't move.
He kept one hand resting near Benihime and watched the ugly little thing coil inside the isolation circle, like something that had only just remembered it was awake.
The room was narrow and lit by a single lamp, and the glass cover threw a dim reflection across the black-red strand.
Anyone wandering in without context might have written it off as a scrap of old binding cord twitching on leftover magic.
Rayleigh had never trusted the convenient explanation, least of all this late at night.
Fels stood by the door, motionless under the black robe. "It repeated the pattern."
"Yeah."
"Can you tell whether the signal came from the cord itself, or through it?"
Rayleigh leaned in, fingers hovering just above the circle without breaking it.
The cord gave off nothing that felt alive. There was no sense of a creature playing dead, no held breath under the surface.
The movement was coming from somewhere else and traveling through the material, the way a knock carries down a length of pipe.
"It's being used as a receiver," he said. "The cord is dead, but something on the other end still knows how to pull on it."
Fels considered that. "Then whoever controls the passage knows the survivor was removed."
"That, or the route itself does. I'm not sure which one's worse, so I'll save that debate for a night I hate myself a little less."
The cord tapped again.
This time Rayleigh listened past the sound itself.
He let his senses run along the trace left in the binding, chasing the faint tug still buried in the material.
It didn't lead cleanly back to the hidden corridor. The line bent through old stone and standing water, through dead air and places that refused to sit still on any mental map.
Even pinned under glass, the cord stayed tied to Knossos in a way no ordinary tool had any right to be.
Fels drew closer to the table. "A deliberate invitation?"
"Probably. It's tapping the exact way Karz described. The figure in the passage knocked on the wall, and the corridor knocked back. Now this piece is doing the same thing, in a sealed room, after we cut it off the victim. That's too much effort for a random aftershock."
Rayleigh took a small metal plate from his pouch and set it beside the isolation circle. He didn't answer the rhythm, not yet.
Answering strange things you didn't understand was how people in horror stories died before the first meal break.
Instead he drew a second, smaller circle around the plate and joined it to the first with a thin line of power.
Fels watched. "What are you doing?"
"Giving it something safer to knock on. If the signal wants to move, it can move into the plate instead of the cord. If it won't, that tells me the cord matters. If it will, we can start reshaping the reply without ever touching the original."
"And if it reacts violently?"
"I break the plate and insult the designer!"
"That is not a method listed in Guild procedure."
"It should be."
The cord tapped once, faint.
The plate answered.
Rayleigh's eyes narrowed.
The sound coming off the plate was lower and cleaner, far easier to read. The cord had been moving like dead muscle. The plate answered like an actual tool, and that alone loosened something in his shoulders.
A thing got less frightening the moment you could move it out of flesh and into metal.
He waited through three more repetitions, then wrote the rhythm down.
Two. Pause. Three.
A few minutes later, the pattern shifted.
Two. Three. One.
Fels bent over the table. "A code?"
"Maybe. Could be a direction. Could be counting how many idiots have answered before us." Rayleigh set the second pattern beside the first and compared them.
"Karz said the figure tapped and the passage moved. So the taps might be commands, not words."
"Door controls."
"Or route controls."
Fels's hood tipped toward the sealed tray. "Daedalus's descendants built mechanisms keyed to blood, to special tokens, to hidden triggers. Sound-based commands were never confirmed. But there were rumors during the Great Feud, of doors that opened when struck in the right rhythm."
Rayleigh looked at the plate again. The new pattern kept repeating, firmer now than before.
"If this is a door command, the invitation's less friendly than it sounds. It could be telling us where to stand so the route can close around us."
"And yet you seem interested."
"I'm extremely interested. I'm also not walking into it just because some damp string learned how to knock."
For once, Fels made a sound that came close to approval.
Rayleigh noted down the next sequence, then drew a third circle around the whole table, sealing cord and plate together under a small layered barrier.
The tapping went on inside it, quieter now, held in tightly enough that it wouldn't bleed out into the room.
"We need Lord Ouranos, Finn, Riveria, and Eina," he said. "Airmid too, if Karz can handle questions tomorrow. The survivors might recognize the rhythm."
Fels nodded. "I will inform Lord Ouranos."
Rayleigh looked from the plate to the cord.
The rhythm changed again.
Three. One. One. Two.
It didn't sound like a simple lure anymore.
It sounded impatient.
...
Morning came with too much paperwork and not nearly enough sleep.
The Guild's lower chamber had been converted into a restricted command room. Maps covered one table, equipment lists another.
Sealed samples sat in marked boxes along the wall, watched over by two Guild employees who looked like they'd been warned, very clearly, that touching anything would end their careers and possibly their lives.
Ouranos heard out Rayleigh's report without once interrupting.
Fels stood at his side.
Finn, Riveria, Eina, Hephaestus, Tsubaki, Airmid, Shakti, and the three Astraea girls had gathered around the main table.
Welf had been let in this time as well, though only after Hephaestus gave him a look that made it plain he was here as a smith, not as a reckless brat hunting for an excuse to sneak underground.
Rayleigh laid the copied rhythm notes on the table.
"The cord we took off Karz is carrying a signal from the hidden route. I moved that signal into a metal plate so we could watch it without letting the cord keep working as the main receiver. The pattern changed several times overnight. I don't think it's speech. It feels more like route commands, knocks used to make a door or a passage respond."
Eina adjusted her glasses and leaned over the notes. "Can the Guild match it against old records?"
Fels answered before Rayleigh could. "I have already begun. A handful of reports from the Great Feud mention rhythmic tapping before walls opened, but none of them are complete. Most of the witnesses died. The ones who survived couldn't reproduce the sounds."
Alise's hands tightened on the edge of the table.
There were dark circles under her eyes, but her expression was steady. "Karz heard it. Lott might have too. We should ask them."
Airmid didn't reject the idea, but she took her time answering, and every word carried weight. "Karz can manage a little, if we keep the questions short. Lott is more fragile. If hearing the rhythm sets his wound off, I stop the interview then and there."
Finn turned to Rayleigh. "Can you play the rhythm without the original cord?"
"Yes. The plate's safer, and I can dampen the sound until it's barely there. I can also show them the pattern on paper first. If their bodies react to seeing it alone, that tells us something too."
Riveria's eyes moved across the map. "If the rhythm is a route command, then tapping it near the wrong wall could open something we aren't ready for."
"Which is why nobody taps it inside the hidden passage yet," Rayleigh said. "Not until we know whether the sequence means open, close, shift, or please step into the murder corridor."
Hephaestus gave him a flat, disapproving stare.
Rayleigh corrected himself with a tired little wave. "The unsafe corridor."
"That is not better," she said.
"It's more polite."
Tsubaki folded her arms and cut in before the room could slide into banter. "Forget polite. Can we build something that taps from a distance? If the rhythm opens a door, I'd rather we were standing somewhere else when the door starts getting ideas."
Welf glanced at her, then down at the notes on the plate. "A striker box. Small hammer inside, worked by a cord or a trigger. Set it against the wall, pull it from a safe distance, and it knocks out the pattern without anyone standing next to it."
Tsubaki's good eye lit up, though her voice stayed rough. "That works. Make the shell heavy enough that the wall can't spit it back the way it did the marker."
Welf looked to Rayleigh, not for permission, but because the spiritual side of it still needed him.
"If we put one of your threads inside, can you tell whether the wall answers before the box breaks?"
Rayleigh nodded. "If the signal lasts long enough, yes. We can fit a life-check tag in there too, though that might muddy the reading if the wall reacts to both at once."
Finn absorbed the proposal fast. "A remote tester. Good. That lets us learn something without putting the team inside the first reaction."
Alise still didn't look satisfied, but she looked less trapped by all the caution now that caution had turned into a plan. "And if the rhythm points to where the captives are?"
"Then we prepare a rescue," Finn said. "A real one, with enough checks that we don't hand the enemy another hostage."
That she could accept, because Finn had said rescue and not delay. To Alise, the two words were nothing alike.
Kaguya studied the rhythm notes, tapping one fingernail against her sleeve instead of the table.
"If the route is listening, we should stop saying names near the samples, too. The fake voice used Captain after it heard us. I'd rather not teach it everyone else's weak points in the middle of a meeting."
The room went quiet at that. She was right, and no one in it needed to be told so.
Rayleigh slid the rhythm pages back into the center.
"From now on, near the samples and inside the route, we use role calls. Captain, mage, shield, healer, smith, scout. No personal names, unless someone's dying and there's no time left to care."
Ryuu nodded. "Difficult, but manageable."
Gareth grunted. "I've been called worse than shield."
Airmid glanced toward the sealed medical notes. "I'll have my staff avoid the survivors' names near any contaminated object as well. If the route is stealing sound, then in the clinic we treat words as exposure."
Eina wrote that down at once.
Ouranos finally spoke, his voice settling over the room like a slab of stone.
"Proceed with the interviews. Build the remote tester. The next entry into the route waits until both are complete."
Alise opened her mouth, closed it again, and nodded.
She plainly wanted to move faster. Even she could see the sense in not walking into a labyrinth that had started sending messages.
Rayleigh gathered the notes and looked to Airmid. "Let's start with Karz."
...
Karz looked better than he had the night before, though "better" only meant he could sit up without falling apart.
Airmid had set the interview in the quieter treatment room, with Lott kept next door under watch.
The windows were covered, the samples were nowhere near the beds, and the only version of the rhythm allowed inside was a clean copy on fresh paper. Rayleigh had left the metal plate sealed in the side room.
He had no interest in discovering that the route could listen through its own handwriting.
Karz held the page in both hands and, at first, only stared at it.
Airmid sat beside him, close enough to take it away if she had to.
Eina stood at the foot of the bed with her report board. Finn and Rayleigh hung back a little further.
Too many people would have turned the room into an interrogation, and Karz had already spent more than enough time trapped.
After a long silence, he swallowed. "That's the sound."
Airmid's hand twitched, ready to steady him, but he kept breathing.
Rayleigh spoke gently. "Which part?"
Karz touched the first sequence with a trembling finger. Two taps, a pause, three taps.
"This one opened the crack. I remember because Bor joked that even the wall knocked better than Will. That was before..."
His voice trailed off. Eina wrote the detail down without pushing him.
He made himself look at the second line. "This one came after the corridor changed. Two, three, one. The wall ahead of us moved. We thought the way had opened, so we ran through it."
Finn's gaze sharpened. "And the third?"
Karz went pale.
Airmid reached for the paper. He held onto it with surprising strength.
"That was when the thing came," he whispered. "Three, one, one, two. We heard it through the wall first. Then it tapped from behind us. Bor swung at it, and after that everything just broke apart."
The answer settled into Rayleigh's mind, and he didn't like where it landed.
The invitation wasn't random.
The route had handed them the exact sequence that called the figure.