In 1940, Chen Yanzhi was imprisoned in Unit 731 and witnessed the torture of his compatriots. He joined forces with Zhao Laogen and Lin Xiuya, who also had consciences, and assembled skilled prisoners to secretly plan a breakout. After going through hardships and dangers, everyone broke through numerous blockades and fled to the Soviet Union with experimental evidence to reveal the truth. After the war, they testified in court, remembering history and defending justice with their own experiences.
