陈一鸣来到监狱，周子武辩解自己没有杀人。陈一鸣质问周子武的枪从何而来，周子武这才如实交代。陈一鸣听完周子武的话，觉得他应该不是凶手。陈一鸣将张天笑、姚菲、高局长、贾探长都请到了侦探社，他用实际行动测算了一遍，证明周子武不是凶手，贾探长给陈一鸣三天时间抓到凶手。周子武凭借着模糊的印象，画出了另一个跟踪者的样貌，也算给了陈一鸣一个参考。
Chen Yiming came to the prison, and Zhou Ziwu argued that he did not kill anyone. Chen Yiming asked Zhou Ziwu where the gun came from, and Zhou Ziwu told the truth. After listening to Zhou Ziwu's words, Chen Yiming felt that he should not be the murderer. Chen Yiming invited Zhang Tianxiao, Yao Fei, Director Gao, and Detective Jia to the detective agency. He used practical actions to calculate and prove that Zhou Ziwu was not the murderer. Detective Jia gave Chen Yiming three days to catch the murderer. Zhou Ziwu relied on his vague impression to draw the appearance of another stalker, which also gave Chen Yiming a reference.
