Beside her bounced Nuki Nuki, a small whirlwind of sun-bleached curls and boundless curiosity. Nuki’s pockets were full of treasures: a half-sand dollar, a marble smoothed by a dozen summers, and a secret map of the shoreline that only children and stars could read. Today, Nuki declared, they were on a mission—to find the perfect pebble, the kind that hummed if you held it up to your ear and told stories of faraway tides.