杜少英和苏少卿是一对双胞胎姐妹，但是在那个战乱的年代，两姐妹被冲散了，从此分别去了不同的地方，加入了不同的阵营，妹妹苏少卿在国民党任职，而姐姐杜少英则是共产党员，在组织的安排下，杜少英成功替代了苏少卿，并且成为了国民党保密局的重要成员。而苏少卿一直被关押在看守所，但是突然之间她逃走了，并且来到了杜少英的面前想要揭穿她的真面目，叶公瑾见状干脆将计就计，让两姐妹都离开了保密局，表面上是释放，实际上就是要看两人之间的互殴，他可以引出共产党背后的人，并且将他们一网打尽。可让他没有想到的是姐妹俩竟然冰释前嫌，彼此承认了亲情，共同携手一起对抗国民党，最后在一次战役中，苏少卿为了保护杜少英而牺牲了，叶公瑾注定了计划失败的结局

Du Shaoying and Su Shaoqing are twin sisters, but in that war-torn era, the two sisters were separated and went to different places , Joined different camps, sister Su Shaoqing served in the Kuomintang, and sister Du Shaoying was a member of the Communist Party. Under the arrangement of the organization, Du Shaoying successfully replaced Su Shaoqing and became an important member of the Kuomintang Secrecy Bureau. And Su Shaoqing has been detained in the detention center, but suddenly she escaped and came to Du Shaoying to expose her true face. Seeing this, Ye Gongjin simply resorted to tricks and asked both sisters to leave the secrecy bureau. The point is to watch the fight between the two. He can draw out the people behind the Communist Party and wipe them all out. But what he didn't expect was that the two sisters put aside their previous suspicions, acknowledged their kinship, and joined hands to fight against the Kuomintang. In the end, in a battle, Su Shaoqing died in order to protect Du Shaoying, and Ye Gongjin was doomed to the end of the plan