Deep in the Municipal Archives, there is a "Special Collection Room" that is rarely visited by people. Here are piles of old files that have not been disclosed since the founding of the People's Republic of China, and also contain countless secrets buried by time. Lin Yanqiu is the only administrator here. A bizarre case three years ago forced her to resign as a criminal police officer and hide in a corner filled with old papers to seek peace. She thought she could isolate herself from the past until a sealed file labeled "1998 Wutong Lane Dismemberment Case" was accidentally uncovered. There was no number on the file bag, and the seal had long since turned yellow and brittle. The files inside the bag were incomplete, leaving only a few blurry photos of the scene, a scrawled witness statement, and half a bloody brass button. What's even weirder is that whenever she touches this file, she will be briefly dizzy, and broken images that don't belong to her flash through her mind - rainy nights, alleys, and blurry black shadows. As the investigation deepened, Lin Yanqiu discovered that the victim of this unsolved case was actually related to her long-dead aunt. The criminal police officer in charge of the case also disappeared mysteriously after the case was closed. The dusty archive is like a door leading to the abyss. The moment it is opened, the shadow follows. Some people wanted her to stop pursuing, and some were secretly watching her every move. Lin Yanqiu had to pick up the magnifying glass again, looking for the hidden truth in the incomplete words and blurred images, while facing the fear and past buried deep in her heart.