Hidden deep in the Himalayas lies a valley no map has ever found, where glowing lanterns hold the world's most meaningful memories: every act of kindness, every promise kept, every story worth remembering. Lio has spent his whole life there, training to become a Lantern Keeper, though he has never once believed he was worthy of it. But when the lanterns begin to fade for the first time in four thousand years, he is the one chosen to leave the only home he has ever known and find out why. Across hidden sanctuaries and a world that doesn't know magic exists, Lio will have to answer a question no chant or ritual can solve for him: what does it truly mean to remember someone, before the light goes out for good.