In 1939, Jiangcheng fell. Shen Hengyu, a translator from Dewei Foreign Trade Co., Ltd., Checked tea accounts for Henderson Wei during the day and hid in the attic at night to decipher the Japanese military secret messages. There were no intuitive cheats in his intelligence analysis brain—additive ciphers, checkerboard ciphers, one-time pads, and every conclusion had to be cross-checked from at least thirty intercepted messages. The intelligence on the three transportation lines that he personally sent made Nomura Ryosuke's team suffer losses, and Wang Puppet No. 76 Began to search for "ghosts" throughout the city. The liaison officer of the new joint, Jiang Shuhan, was once a cold-blooded killer of the military commander. He was arrested for betrayal three years ago, but now he is sitting opposite him on the same chessboard. The first time she cooperated, she covered his withdrawal from the telegraph point, at the cost of seven more bayonet wounds on his back. Shen Hengyu pushed the medical bag over: "You should hate me." Jiang Shuhan bit the bandage and knotted it: "Hate. So you have to live until the day of victory, and let me settle the score with my own hands." When Fang Yanqiu's theater troupe was pulled for investigation, when Aheng (Liu Sanmei)'s pocket watch appeared in the interrogation room, when every decipher meant that a familiar name must disappear from the world tomorrow - Shen Hengyu learned to use numbers to cover up his tremors. He set an iron rule: after any cover line is exposed, all personnel must be transferred within 24 hours. After one second, all personnel will be disconnected. But Nomura Ryosuke made the last move on the mute girl he adopted. This time, there was no probability in the intelligence, only one person's blood.