During the Anti-Japanese War, the Japanese army, aiming to smoothly occupy Changsha, activated a strategic spy known as "Black Butler" who had been undercover in China for 15 years, to carry out a long-planned strategic deception. A Communist Party underground member, Yun Muzhi, was killed in the process of investigating "Black Butler." His son, Yun Hongshen, pursued the murderer and was caught in a trap already set by "Black Butler." In times of confusion, a close friend of his father provided him with significant assistance, allowing him to finally see through the adversary's schemes. Under the leadership of the Communist Party, Yun Hongshen joined forces with the patriotic youth Wen Yeming, setting traps within traps, setting himself up as a sacrifice to uncover the Japanese strategic spies hidden within the Nationalist army, turning the tide of the war, and making a significant contribution to the victory of the first Battle of Changsha.
抗日战争时期,日军为顺利占据长沙,启用潜伏在中国15年的战略特工“黑执事”,实施策划已久的战略欺骗计划。中共地下党党员云慕之在调查“黑执事”的过程中被杀。其子云弘深在不知父亲真实身份的情况下追查凶手,被卷进“黑执事”早已布下的陷阱中。在云弘深迷茫无助之时,父亲生前好友给了他极大地帮助和保护,他终于识破了对手的骗局。在共产党的领导下,云弘深和爱国青年闻夜鸣联手,局中设局,步步为营,在国恨面前放下家仇,将自己设为死棋,挖出了深藏在国军内部的日本战略特工,扭转了战局,为取得第一次长沙会战的胜利做出了极大的贡献。