本片讲述的是1937年8月13日爆发淞沪会战前夕，鬼子的狼子野心企图从从杭州湾登陆南北攻击上海，因此专门派入一支精锐到达军事要塞江城打探情报，鬼子假扮混进国军士兵，最终还是被还是共产党员赵景舟一眼拆穿，就此展开激战，鬼子损兵折将，便仓皇逃窜，后来众多鬼子在江城集结，而赵景舟儿时好友姜丰亭也在其中，日本人的姜丰亭，自幼父母双亡，被中国留学生姜万林抚养长大，之后舅舅把他接回日本，而姜万林的女儿姜梅和赵景舟是青梅竹马，没想到的是姜丰亭居然会恩将仇报杀回江城，而他的真实身份居然是一个冷血杀手，2位儿时好友展开知己知彼的斗智斗勇对决，最终赵景舟将所有日本鬼子杀伐殆尽，赶出了江城，在战争期间，赵景舟和姜梅恋爱关系承受着许多压力，赵景舟的师长齐满堂强迫要他娶其女齐如花，于是赵景舟就在两个女人中间为难抉择，经过了重重磨难和误会，他们一起发生了一些感人至纯的事迹…

This film is about the eve of the outbreak of the Songhu Battle on August 13, 1937. A special elite group was sent to Jiangcheng, a military fortress, to inquire about intelligence. The devils pretended to be soldiers of the national army, but they were eventually exposed by Zhao Jingzhou, a member of the Communist Party. Zhao Jingzhou's childhood friend Jiang Fengting was also among them. The Japanese Jiang Fengting, whose parents died when he was young, was brought up by the Chinese student Jiang Wanlin. Later, his uncle took him back to Japan, and Jiang Wanlin's daughter Jiang Mei and Zhao Jingzhou were childhood sweethearts. What I thought of was that Jiang Fengting would be kind and kill him back to Jiangcheng, but his real identity turned out to be a cold-blooded killer. The two childhood friends started a battle of wits and courage, and finally Zhao Jingzhou killed all the Japanese devils and drove them out of Jiangcheng. During the war, the love relationship between Zhao Jingzhou and Jiang Mei was under a lot of pressure. Zhao Jingzhou's teacher Qi Mantang forced him to marry his daughter Qi Ruhua, so Zhao Jingzhou was in a dilemma between the two women. After many hardships and misunderstandings, they came together Some touching and pure deeds have happened..