Abby held the tattered sketch she’d made of her younger sister—charcoal smudged where Luna’s smile used to be. "She wouldn't just leave," Abby whispered, her voice swallowed by the damp, salty wind of the City of Echoes.

"The song isn't outside. It's inside the silence between echoes."

Abby knelt and hugged her sister, feeling the warmth of a body, not a ghost. The echoes in the well slowly faded, one by one, until only silence—and the soft sound of three people breathing—remained.

That was when Abby understood. Luna wasn't lost. She had gone looking for the source of the hum, but the hum was just a trailhead. What Luna truly searched for was a place where her own thoughts would stop ricocheting and finally rest.

"Luna!" Abby cried.