Three trainee apprentices on Prometheus intercept a strange signal from Gliese 486b and steal off-world to trace its source, only to land on a planet that seems to answer back.
The observation dome on Prometheus was supposed to be quiet after lights-out. Instead, Thomas stood with his forehead against the glass, staring at Saturn's pale rings while the station hummed around him like a held breath. Lena, his sister, was stretched out in the nearest chair with a holo-chess board flickering above her wrist. Raj barely looked up from the half-built robot in his lap.
"If you keep watching the same planet long enough," Lena muttered, moving a chess piece without looking, "it still won't do anything interesting."
Thomas was about to answer when the old radio receiver gave a scratch of static. Then another. Raj froze. The noise came again, this time in a pattern so precise it made the hair on Thomas's arms rise. Not random. Not broken. Almost like music, if music had been cut into pieces and sent across space.
Lena was at the console before either of them had spoken. Her fingers moved fast over the keys, her expression sharpening with every line of data that lit the screen. "That isn't coming from the station," she said. "It's coming from Gliese 486b."
Thomas stared at her. The planet sat dozens of light-years away, cold and inhospitable on every map they had ever studied. No signals. No life. No reason for anything to be there except rock, storm, and darkness. Raj's mouth had already fallen open.
"Then what is it?" he whispered.
Lena didn't answer right away. She ran the signal through the translator again, slowed it down, stripped away the noise. A fragment surfaced, fractured and incomplete, but clear enough to turn the room colder.
A warning.
By then they were already moving, packing equipment in hurried silence, pulling research gear, a compact drone, extra power cells, and whatever else would fit in the capsule before anyone noticed. It was reckless. It was unofficial. It was exactly the kind of mistake that felt impossible to stop once it had begun. Thomas took the controls, Lena held the translation file open beside her seat, and Raj kept one hand on the drone’s launch cradle as Prometheus slid away behind them.
The descent toward Gliese 486b started smoothly. Then the capsule shuddered.
Every screen on the panel flashed black. For one terrible second, Thomas thought they had lost power altogether. When the displays came back, the signal was still there, but now it was overlaid with a string of pulsing symbols that did not match any human language he knew. Lena went still. Raj leaned closer to the screen.
"That isn't a transmission," she said quietly. "It's reacting to us."
They broke through the cloud layer and saw the surface below: a wide black plateau glittering with jagged crystals that caught the weak light like shards of broken glass. No trees. No water. No visible path down, only stone and shadow and a silence so complete it felt deliberate. The capsule touched down hard enough to rattle their teeth.
The signal inside the cabin suddenly strengthened.
Raj sent the drone forward first. Its camera feed jittered over the ridge line, past the crystals and into a hollow between the rocks. For a second the image blurred, then sharpened just enough to show movement. Something tall and narrow crossed the frame. A light flickered once, as if from deep inside the ground.
Then the receiver crackled one more time, and the translation locked into place.
You are not alone here.
The plateau began to tremble beneath their boots. Thomas lurched for the console, Lena grabbed the edge of the hatch, and Raj stared at the drone feed as another shape slid into view between the rocks, closer this time than any of them had expected.