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[Criminal Investigation + Portrait Artist + Trace Inspection + Railway Criminal Police] An unknown head was found on the railway line. Because the face was destroyed, Detective Zhang Xin used the new technology of simulated portrait to restore the portrait. By posting a missing person notice, the police identified the deceased as Wang Zhilong from City B. During his lifetime, he was a loan shark boss. After interviewing people who were closely related to the deceased, just when a suspect was identified, the suspect was suddenly killed, and the clues came to an abrupt end. The worst is yet to come. With the emergence of the third murder, the entire case escalated into a vicious serial murder case. According to the clues left by the murderer at the scene, it is suggested that a fourth case will definitely occur, and the time of the crime will be on the night of the opening ceremony of the Olympic Games. The opening ceremony of the Olympic Games is approaching. Can Zhang Xin solve the mystery of the key clues deliberately left by the murderer in a very short period of time and capture the "black shadow" hiding in the dark?

[Criminal Investigation + Illustrator + Trace Inspection + Railway Criminal Police] Fan Xiuli, a rising star in the painting world, suddenly disappeared. A week later, a floating corpse was found in the artificial lake of the Academy of Fine Arts. Detective Zhang Xin intervenes in the investigation. During the visit, strange incidents occur one after another. Cui Xin, the ex-boyfriend of classmate, Cao Deli, a hidden wealthy businessman, and Li Wanpeng, a specially appointed professor, are all suspected. After in-depth investigation, Zhang Xin found clues in a copied painting...

[Criminal Investigation + Portrait Artist + Trace Examination + Railway Criminal Police] Zhang Xin, a fledgling railway police officer, witnessed his master Zhou Peichi dying in a pool of blood. Due to limited clues in the case, the case became unsolved and became a heartache for Zhang Xin. From then on, Zhang Xin was unwilling to be a line policeman with "one section in charge" and determined to become a criminal policeman to catch the murderer. A graffiti at a crime scene turned out to be the key to solving the case, which led him to enter the field of simulated portraits and join the criminal police detachment as he wished. He worked hard to practice his painting skills and successively helped solve many major railway cases, thus starting the legendary life of the "Magic Pen Detective". One day. Zhang Xin received a call that a shooting case had occurred in Lucheng. The warhead left at the scene of the crime rekindled Zhang Xin's hope, so he rushed to Lucheng overnight and drew a simulated portrait of the gangster based on the descriptions of witnesses. He looked at the familiar head portrait, thoughtfully...

[Novel, suspense novel, criminal investigation, realistic reasoning] Only dead people cannot speak. Late at night on Christmas Eve, two thieves sneaked into a luxury villa and failed to steal. They only found two exquisite globes. Before leaving, they unexpectedly found two corpses being eaten by hamsters. Just as he was about to escape, the murderer appeared. In fear, the globe in his hand fell from his hands, revealing the dead man's skull inside, and the murderer was closing in step by step... In this remote Xiuhu town, the three missing persons disappeared on Christmas Eve. As the police investigation deepened, a case that occurred on Christmas Eve three years ago attracted the attention of the police. The murderer in that case was called the "Christmas Eve Ghost." How are the two cases related? What's the secret of the "tall, handsome, and wealthy" homeowner? Why are there dead skulls in the beautiful globe? Multiple police forces joined forces to track down this mysterious case that spanned three years... Dead people cannot speak, but there is always evidence pointing to the murderer!