The files of the "Red Maple Lane Serial Disappearance Case" that had not been solved for ten years had been sealed for a long time, until a new criminal investigation consultant was looking through the files and was horrified to find that his fingerprints were printed next to the blood stains at the scene - but he was only twelve years old at the time, and there was no way he would be present at the crime scene. As the investigation deepened, he discovered that he was actually the only "eyewitness" whose memory had been erased, and that someone within the police force was secretly destroying evidence. When the truth was gradually pieced together, Shen Yan realized that the murderer was none other than his most trusted mentor, and that fingerprint was a carefully designed trap just to lure him into a trap.
