The Eighth Knock

The eighth knock came from inside Eira’s chest.

It was softer than the bell beneath the Halo, but the machinery answered it. Copper ribs shuddered around them. The chamber’s flooded floor lifted in a slow, impossible breath, and every loose bolt leapt toward the black aperture in the bell’s base.

Suda tightened the strap across his waist. “That,” he said, “is a sound I have spent my entire life avoiding.”

“Your entire life?” Klain asked.

“Most of it. The profitable parts, certainly.”

Eira barely heard them. Her prosthetic had gone rigid from wrist to shoulder, its fingers spread against the bell’s corroded flank. Beneath her breastbone, the key turned once. Not clockwise or against it. It turned as though the direction belonged to another world.

A child’s voice whispered through the metal.

“Which keeper?”

The words did not enter through Eira’s ears. They appeared in the spaces between her thoughts, cold and clear. Klain flinched anyway. His face emptied of color.

“Aren,” the voice said.

He stumbled backward and struck the machinery. “Don’t call me that.”

The bell gave another note—not a pulse this time, but a question stretched into sound. It traveled through the chamber and into the rotating bones of Noah’s Halo. Far above, something enormous shifted. The city’s gravity changed. Suda’s boots lost contact with the deck, and he hung for one breath beside them before dropping hard.

Eira caught his coat with her mechanical hand.

“Thank you,” he wheezed. “I prefer my drowning with warning.”

On the bell’s inner rim, letters emerged beneath the film of black water. They had been hidden by rust, or by the angle of the chamber. Eira wiped them clear with her sleeve.

ONE KEEPER OPENS.

ONE KEEPER REMEMBERS.

Below the old inscription, a third line was being cut into the metal from the inside.

THE DOOR MUST KNOW BOTH.

Klain stared at it. “The lock isn’t asking for a key.”

“It has a key,” Eira said.

Her hand went to her chest. The black key had vanished into her years ago, or had always been there. She could feel its teeth aligned against something on the other side of her ribs.

“It’s asking who we are.”

“No,” Klain said. He pressed both hands over his mouth, fighting for breath. “It already knows. That’s why it called me.”

His eyes unfocused. The chamber fell away from him, and for an instant he was not the exhausted oracle of Noah’s council. He was a small boy standing on a shore that had not yet risen from the sea. Black water lapped around his ankles. Behind him, a veiled figure held the key. Before him stood the dark-glass presence, faceless and tall, reflecting the drowned sky.

The presence had not been guarding the shore.

It had been waiting for the boy to remember the way home.

Klain gasped and returned to himself. “The thing beneath us is not the prisoner.”

Suda’s expression tightened. “We have had this conversation. It is either the prisoner, the door, or something pretending to be both. I was hoping for a fourth option involving escape.”

“It was the lock’s witness,” Klain said. “The one that watches the keepers. The red shape isn’t trying to get into the Halo. It is trying to make sure we open it correctly.”

The red light appeared below the grating.

Not an eye this time. A line. It traced a circle beneath them, vast enough to contain the underside of the city. Along its edge, seven points ignited, then an eighth. The eighth did not shine red. It shone white, the color of moonlight seen through deep water.

Eira’s prosthetic began to speak in the veiled voice.

“You promised him a shore.”

“I promised a child,” Eira said, though she could no longer remember making the promise. “Not whatever waits below.”

The voice answered through her fingers. “The child is the shore.”

Klain stepped toward her. “Eira. What does it want you to do?”

She looked at the black aperture in the bell. Inside it, darkness folded inward, revealing a stairway descending through open water. At the bottom stood a door made of pale stone. No tide moved around it. No current disturbed the silt.

The key in her chest turned again.

“Open,” she said.

Suda swore. “That is exactly the sort of word that kills a crew.”

“Not me.” Klain’s voice shook, but he came to Eira’s side. “I remember.”

The bell rang once more. The Halo completed its rotation with a violence that threw all three of them against the chamber wall. Above, Noah’s lights went out entirely. Below, the red circle sealed shut.

Then the pale door opened by the width of a child’s hand.

From beyond it came the sound of waves breaking on land—and, beneath that, thousands of voices whispering Eira’s name.