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The fifth part of the "Crime" series. The sharp blade of the knife flashes with a dazzling cold light, The low dusk concealed a series of murderous intentions. There are open spears and hidden arrows, traps and traps, the dark clouds have dissipated, and the dawn is approaching. The protagonist "I" enters the public security system after graduating from the police academy. My ideal was to be a criminal police officer, but my boss assigned me to work in the archives department. In order to work, I began to look through the dusty files on the file shelf. As the reading progressed, I discovered the investigation files of many cases. Reading each story is both alarming and thought-provoking. The story is thrilling, twists and turns, full of suspense, and its excitement is no less than a wonderful detective mystery novel...