Seventeen-year-old Adam and his younger sister Lena find a hidden city on the border of light and shadow during a night hike, and something in the dark seems to be waiting for them.
Adam was drifting through the empty streets of his hometown, hands in his pockets, listening to his shoes scrape over the wet pavement. In two days he would be seventeen, and for as long as he could remember he had had the unsettling feeling that the world was holding something back from him. That night, Lena had insisted on coming with him.
His fourteen-year-old sister looked far too pleased with herself for someone carrying a backpack stuffed with torches, a compass, and enough snacks to survive a siege. She kept glancing at the dark windows of the tenements as if she expected them to blink back. The streetlights threw pale halos across the road, and the old facades seemed to breathe in and out with the rain.
Lena stopped first. Under one lamp, the shadow pooled too thickly, almost black enough to have weight. It did not lie flat on the ground like the others. It stood up from the pavement in a wavering sheet, as if the night had peeled itself loose.
"Tell me you see that," Lena whispered.
Adam did not answer. The darkness was moving, not much, just enough to make his skin tighten. It looked like a curtain stirred by a wind he could not feel. Before he could stop her, Lena reached out and touched it.
Her hand vanished to the wrist.
"Lena," Adam said, grabbing for her arm. He caught her, but the shadow pulled harder than he did. The edge of it rippled open, cold and soundless, and then both of them were dragged through as if the street had turned to water beneath their feet.
They hit the ground softly, on something springy and damp, and for one stunned second Adam thought they were still on the same street. Then he looked up.
The city around them was not theirs. It stretched away under a moon the colour of tarnished silver, all narrow lanes and glass-bright walls, lanterns glowing in a strange blue light. No two buildings matched. Some rose like faceted crystal; others leaned together in impossible angles, all sharp edges and shadows that did not stay still. Silent figures moved through the streets, only half there, as if they had been cut from smoke.
Lena tightened her grip on his hand. Her face was pale, but her eyes were shining.
Adam turned slowly, searching for a road he recognised, for the crack in the world that had brought them here. Instead, he found a narrow alley between two gleaming buildings and, at its mouth, a shape that had not been there a moment ago.
Someone was watching them.
A soft rustle came from the alley, followed by a small laugh, almost amused. Then a tall figure stepped out from behind a glass door. She was too thin, too still, her pale eyes catching the lantern light like coins dropped into deep water. She lifted one hand and pointed, wordlessly, toward the dark entrance behind her.
Lena took a step forward.
Adam opened his mouth to stop her, but another sound rose behind them first: a broken melody, notes coming apart and reassembling in the air, wrong and distant and far too close at once. The shadows under the lanterns stretched toward their feet.
The woman in the alley did not move. Lena did not look back.
And somewhere in the blue-lit city, something laughed again, right beside Adam's ear.