东北全面解放后，某一个城市，我公安机关逮捕了潜伏特务李天民，确凿证据面前被迫承认了自己特务身份，但对进行特务活动却拒不交待。不久，一个送牛奶孩子在李天民住所放下了一瓶鲜牛奶，而牛奶瓶塞上有一个用化学药水写的字条，孩子收走了门前空瓶子。另一栋房子里，孩子将空瓶交给另一个特务周少梅。特务发现李天民出了问题，为防止公安局从孩子身上发现线索，残忍地将孩子杀害。当公安机关赶去调查时，房子里已经人去楼空。这时候，刻字店主人接待了一个要刻假图章可疑客人，立即向公安局做了报… After the comprehensive liberation of Northeast China, in a certain city, our public security organs arrested the lurking spy Li Tianmin, who was forced to admit his identity as a spy in front of conclusive evidence, but refused to disclose his involvement in spy activities. Shortly after, a milk delivery child placed a bottle of fresh milk at Li Tianmin’s residence, and there was a note written in chemical solution on the stopper of the milk bottle. The child took away the empty bottle in front of the door. In another house, the child handed the empty bottle to another spy, Zhou Shaomei. The spy discovered that Li Tianmin had a problem and brutally killed the child to prevent the public security bureau from discovering clues from the child. When the public security organs rushed to investigate, the house was already empty. At this moment, the owner of the engraving shop received a suspicious customer who wanted to engrave a fake seal and immediately reported to the public security bureau

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