Coral had one tide to prove she was a queen, and nothing in her satchel but a fisher's knife and a story no one believed. She swam the last stretch to the reef court with her tail aching, rehearsing the words she had practiced for a year. Her mother had told her the truth on her deathbed: Coral was the lost daughter of the old coral throne, hidden among common folk to keep her alive. The current court sat on a throne that was not theirs. Coral meant to take it back. The guards laughed when she asked for an audience. A girl with sun-bleached hair and a patched shell top, claiming the coral crown. They let her in only because the regent's court enjoyed a joke. Coral swam between the pillars and faced a hall of nobles who were already smiling. She spoke her mother's name. She spoke her own. She named the birthmark on her shoulder, a pale spiral the size of a coin, and pulled her hair aside to show it. The regent leaned forward, then leaned back. A birthmark, he said, is not a bloodline. Bring a relic. Bring a witness. Bring a crown. Otherwise, leave. The nobles laughed again, louder this time, and a guard took Coral's arm to steer her out. She swam until the laughter faded, then kept swimming until the reef gave way to soft weeds and warm springs. A green-haired mermaid was waiting at the edge of a shallow pond ringed with stone and bright flowers. Marina said she had felt Coral coming for three days. She said the water here remembered old blood. She pointed to the surface, where light moved in slow rings. Coral hesitated. Marina held out a tall staff carved with white diamonds and pressed it into Coral's hands. Speak your mother's name into the water, Marina said. If the pond agrees, it will answer. Coral gripped the staff and leaned over the pool. She said her mother's name. She said her own. The water lit from below. A smaller mermaid rose through the glow, dark curls floating, a luminous crystal cupped in her palms. Pearl set the crystal on the stone rim. It pulsed once, slow, matching the beat under Coral's ribs. Marina spoke plainly. The crystal only wakes for the coral line. Carry it back, and the court cannot call you a liar. But the regent will know within the hour, and he will send hunters before you reach the reef. Coral closed her hand around the crystal. It was warm. She had wanted proof, and now she had proof, and now she had to survive long enough to use it.

Coral held the warm crystal in her fist and looked back at the pond. The light under the water was already fading. Marina drifted at the rim, watching her. Pearl floated just below the surface, dark curls fanning out. Coral had proof now, but she had no pocket deep enough to hide it and no route home that the regent's hunters would not guess. "They will search my satchel first," Coral said. "They will search my hands. They will search the reef road." She turned the crystal over. It pulsed against her palm like a second heartbeat. Anyone within a spear's length would see the glow through cloth. Marina swam closer and pressed the diamond-studded staff back into Coral's free hand. "Hide a light inside a brighter light," she said. "The staff has hollow stones. One of them will take it." She tapped a diamond near the crown of the staff. It clicked and slid aside, showing a small empty socket. Coral hesitated. If she sealed the crystal inside the staff and the hunters broke the staff, she would lose both. If she kept the crystal loose and they searched her, she would lose everything at once. She weighed the risks and chose the one she could carry openly. A staff was a staff. A glowing stone in a satchel was a confession. She fit the crystal into the socket. The diamond cover slid back with a soft snap. The glow dimmed to almost nothing, muffled by the white stones around it. Only a faint warmth in the wood told her the crystal was still awake. Pearl rose higher and set her small hands on the stone rim. "The staff will answer only to you now," she said. "If another hand pulls the diamond, the crystal will go dark and stay dark until a coral hand wakes it again." Coral nodded and gripped the shaft. The wood felt heavier than before, or maybe she did. A horn sounded far off, thin and flat across the water. Marina's head snapped toward the sound. "That is the regent's call," she said. "They are moving already. Not to the reef road. Here." Coral looked at the narrow paths out of the spring. She had hidden the proof, but she had traded one problem for a worse one. The hunters were not waiting on the road home. They were coming to the pond, and she was still inside it.