A harsh phone ringing awakened Lin Yunfei from his sleep. The urgent voice of Deputy Section Chief Dong Zhichao came from the phone: "Engineer Qin of the Eighth Institute of Technology lost a confidential document package containing important scientific research projects at the train station. This matter caused great concern among the upper management. Attention, you hurry to the Railway Public Security Bureau." When Lin Yunfei and scout Cao Yang drove to the Railway Public Security Bureau, Dong Zhichao told Lin Yunfei that the police had solved the case and it was an ordinary theft, and asked Lin Yunfei to finish the work with the police. When Lin Yunfei watched the interrogation video of the thief, he discovered a flaw and quickly reported it to the director of the department, Hong Zicheng. Director Hong, who has rich investigative experience, was keenly aware that this was probably a spy case, decided to take over the case, and took quick measures. During the screening and investigation of the relevant personnel of the Eighth Institute, it was discovered that Zhang Quan was a major suspect. Just when he was about to be questioned, Zhang Quan was suddenly killed. After investigating the scene and questioning witnesses, three suspects who may have killed Zhang Quan were detained and interrogated. However, the performance of the three seemed to be logical and there was no reason to kill Zhang Quan. At this time, superiors informed that the stolen information may be automatically transmitted via satellite within 48 hours. Time passed by and the case made no progress. Lin Yunfei proposed a bold idea
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