The star fell wrong. Nephthys Starweaver had charted the sky for years, and stars did not dip. They held their paths like fixed nails in a dark ceiling. But this one dropped, slowed, then curved down toward the water like it meant to land. She was a sphynx mermaid who mapped the heavens for no one, only to know them. Tonight the heavens had broken their own rule, and she meant to find out why. She swam after it. Her tail cut through black water that stretched for miles. The star sank ahead of her, low and steady, dragging her past dark waves toward a shape on the horizon. An island rose from the sea. Its sand was black and glittered like crushed glass. She had never mapped this place. No chart of hers held it. Nephthys hauled herself onto the shore. The sand sifted warm under her scales. Small mounds of it caught the starlight and sparkled. One mound held a shard of gold at its peak, bright as a chip of the fallen star itself. She pressed her hand to it. Somewhere far off, past a stand of dark grass and a still black pool, the sky had swallowed the star whole. Then she saw the cat. A skeleton cat sat at the water's edge, white bones bright against the black. She did not run. She did not startle. She watched Nephthys with two glowing eyes and flicked her bony tail, as if she had waited a long time for someone to arrive. "You followed it," the cat said. "Good." Nephthys stared. "You can speak." "I am Rue." The cat turned back to the sea. "Sit. It is not done falling." Nephthys lowered herself into the sand beside her. She did not know this creature. Still, something in the flat, plain voice made her trust it. Rue pressed her bones deep into the warm grains until the sand held her still. She looked content there, like she belonged. Together they watched the water. The waves lapped black and slow. Above them the stars burned in their usual places, all except the empty spot where the fallen one had been. Nephthys reached for her journal from habit, then stopped. There was nothing yet to write. "It went into the water," Rue said. "Not the sky. The water." "Stars don't fall into water." "This one did." Rue's eyes stayed fixed on the waves. "It left something down there. It wants to be read." Nephthys felt the cold pull of the black sea against her tail. Whatever had crashed below was not a star she could map from shore. It was buried in the dark water, waiting. She had spent her life reading the sky. Now the sky had handed her something she would have to dive for. "Then I'll read it," she said. Rue's tail curled around her bones. "I hoped you would say that."

Nephthys took one last breath and dove. The black water closed over her tail. She swam down past hanging sheets of dark kelp that brushed her arms like wet fingers. The deeper she went, the more the water thickened around her. Small flecks of light drifted in the dark, like stars caught underwater. Below her, on the sea floor, something gleamed gold. She kicked toward it. A shape rose from the silt, tall and dark, with two glowing eyes fixed on the light. She froze. It did not move. It was only stone, a carved marker guarding the thing that had fallen. Between its feet lay a star of gold. Its five points spread wide. Egyptian marks covered every inch of it, pressed deep into the metal. This was the fallen star. This was what Rue wanted read. Nephthys wrapped both hands around it and pulled. The silt let go. The star was warm, warmer than the cold water had any right to allow. She turned and swam up, holding it to her chest. Her lungs burned. The surface glowed far above. She broke through and gasped. She dragged herself onto the black sand. The grains stuck to her scales and glittered. Rue was already waiting, bones bright against the dark, tail flicking fast. "You have it," Rue said. Nephthys laid the gold star on the sand between them. "It's covered in writing. Marks I've never mapped." She traced one carved line with her finger. The metal glowed brighter under her touch, as if it woke. Rue leaned close. Her glowing eyes went still. She did not blink. She did not speak. Nephthys knew that stillness. Rue went silent only when a star refused to be named. "Rue," Nephthys said. "What is it?" Rue's voice came flat and quiet. "It is a message. It is not finished." "Not finished how?" Rue lifted one bony paw toward the sky. "Look up." Nephthys looked. The star in her hands had begun to burn hot. Above them, the black sky cracked with light. One star dipped. Then another. Then ten. They fell in a slow, spread-out drift, each one a small yellow flame sliding down toward the sea. They did not streak and vanish. They came steady, like they were called. Nephthys stood, the gold star heavy in her arms. "I only took one," she whispered. "I only pulled one loose." "You read the first line," Rue said. "The rest is coming down to be read too." More stars broke free. The sky that Nephthys had charted her whole life began to empty, point by point. Each falling light aimed for her black water. She held the gold star tight and understood. She had not ended the fall. She had started it. The message was scattered across the whole sky, and now the sky meant to deliver every piece.

The stars kept falling. Each one struck the black water and sank fast. Nephthys waded in after the third splash and grabbed only wet sand. The tide pulled the fallen piece deeper before her fingers closed. She stood in the shallows, soaked, empty-handed. "I cannot catch them one by one," she said. "They land everywhere. The water takes them." Rue sat on the dry sand. "Then stop chasing them. Build a place to bring them." Nephthys looked at the black beach. Broken glass shards glinted where old starfalls had cooled. Baked sandstone lay in flat slabs. She had a plan now. She would build two rooms. Two pyramids. One for storage the other to observe stars in. One desk. She would carry every fallen piece there and read them with Rue. She worked through the night. Rue trotted along the tideline and nosed out glass shards, then dragged them back in her jaws and dropped them at Nephthys's tail. "Sharp one here," Rue said, spitting out a shard. "And here." Nephthys stacked sandstone into two joined walls that rose to points. She fit dark glass into one wing so the sky showed through. She set glittering plants along the glass so it looked into the night like an eye. By dawn the twin black peaks stood on the beach. Inside, Nephthys dragged a carved writing desk against the far wall. The desk's front showed gold constellations pressed into dark wood. She set it beneath the wall panel of smooth black stone. She lifted the first gold star, the one she had dived for. She drew a small eyeglass from the desk drawer and held it to the metal. The tiny lens made the carved marks huge. She read them slow, matching each inscription to the next like a chart. The message linked and joined. Her hands went cold. She lowered the eyeglass. "Rue," she said. "It says the end is coming. An end for this island." Rue climbed onto the desk. Her glowing eyes fixed on the star. She went still, the way she went still for stars that would not be named. "What kind of end?" Rue asked. Nephthys turned the star over. She checked every point. She checked her notes and her star chart hanging above, hoping the rest was carved there. Nothing. "It stops," she said. "It warns of the end and stops. It never says how. It never says when." “The rest of the pieces may finish the prophecy.” Rue did not move. "Then we know the worst part," she said. "And none of the useful part." Nephthys set the eyeglass down. She had her house. She had every piece. She had half a warning and no way to answer it. Now she just needed to keep collecting the star fragments and finish its message before the worst was to come.