陈一鸣受伤终于苏醒过来，姚菲和小咖都过来照顾他，张天笑也在病房里陪护。张天笑三人准备去日料店，店家三田先生离奇死亡。姚菲根据三田脖子上的伤口判断，凶器应该是远距离投射过来，而且上面还抹了氰化物，张天笑也发现电闸被人动了手脚。姚菲提议从凶器着手，很快便找到了涂有氰化钾的飞镖。贾探长将矛头对准小伙计，小伙计再三辩解，贾探长便怀疑墨镜男。
Chen Yiming finally regained consciousness after being injured. Yao Fei and Xiao Ka came to take care of him, and Zhang Tianxiao also accompanied him in the ward. Zhang Tianxiao and three others were about to go to a Japanese food store, but the store owner, Mr. Mita, died mysteriously. Yao Fei judged from the wound on Santian's neck that the murder weapon should have been projected from a long distance and had cyanide smeared on it. Zhang Tianxiao also found that the switch had been tampered with. Yao Fei suggested starting with the murder weapon, and soon found the darts coated with potassium cyanide. Detective Jia pointed the finger at the young man, and the young man defended himself repeatedly, so Detective Jia became suspicious of the man in sunglasses.
