A strange secret room murder occurred in an old residential building. The carotid artery of the deceased was accurately severed. No murderer, weapon or any external traces were left at the scene. Lu Xun, the city bureau's on-site recorder, was responsible for counting and registering all the evidence. Among the neglected debris, he found a piece of transparent plastic without scale.
Everyone focuses on the special metal weapons and foreign infiltrators. No one cares about this inconspicuous fragment, but they don't know that it is the fatal weapon that takes away lives. With his keen observation of subtle evidence, Lu Xun followed the secret clues left by the fragments and gradually discovered that this was not an isolated murder. There was a serial murderer who was good at creating traceless murders hidden in the darkness of the city. He used the records as a basis and the evidence as a guide to unravel perfect crimes one after another, and gradually opened up the dark fog shrouding the entire city.
Intent: There is no perfect crime, only slighted details. Death is cold and sin is secret, but there are always people who carefully preserve all the tiny traces in the world, not only to seek justice for the deceased, but also to give the trivial things that have been scrawled and ignored the weight that should belong to them.