Lingnan City, an ancient mountain town rarely visited by outsiders, is peaceful and pleasant, with simple, honest people.
Forgotten by the world, this place was the site of an utterly baffling unsolved case twenty years ago:
An ordinary elementary school vanished without a trace in broad daylight. The entire campus was gone...
Twenty years later, at the request of a middle-aged couple with heads of white hair, Old Jiang led his investigation agency to the small mountain city that had long been shrouded in darkness. But how could he have known that this would become an endless abyss, more terrifying than any nightmare...
