The story takes place in the early 1940s, on the eve of the Japanese surrender of Shanghai, the Japanese secret service in Shanghai, the head of the Ume Agency, Matsuda Teisho had hidden a list of long-time lurking agents called the "Blue File". In order to obtain this list, the Kuomintang Central Intelligence Bureau sent the Central Intelligence agent Zhao Kang to successfully penetrate into the Japanese secret service agency Mei organs; at the same time, the Kuomintang Military Intelligence Bureau also dispatched the Military Intelligence agents Silver Fox and Ice Cold to carry out this task from Chongqing to Shanghai.
Chinese agent Zhao Kang sacrifices his honor and his love for Shen Yaqi to fight with Matsuda and gain Matsuda's trust and access to top-secret information. In order to gain personal benefits, Silver Fox, a military agent, secretly colludes with the Japanese secret service, sells information, and keeps on poisoning the agents of the Central Intelligence Agency (CIA). The U.S. Intelligence Agency was also coveting this blue file and sent U.S. Central Intelligence Agent Feng Tianjue to secretly collude with Silver Fox in an attempt to steal it. In order to completely shatter the enemy's counter-attack plot and welcome the liberation of the whole country, the Party assigned Party underground workers He Debiao and Shen Yaqi to disguise themselves as Kuomintang Central Intelligence Agents and start a deadly struggle with the enemy around the blue file.
He Debiao and Shen Yaqi, agents of the Central Intelligence Agency (CIA), are initially unaware of each other's true identities and set up a defense against each other. Shen Yachi performs well in his first mission to kill the K of Spades and gains the absolute trust of the CTS. However, when Zhao Kang led the secret agents to carry out the mission, he let go the best time to kill Shen Yachi, which made the Japanese suspicious. Shen Yaqi was also suspected by the Kuomintang and the ****anese Party respectively. Fang Yansong, an agent of the ****Productivity Party, secretly defects to the Kuomintang, resulting in the destruction of many underground organizations of the ****Productivity Party by the Kuomintang. Just as Zhao Kang receives an order to return to the army from the highest level of the Kuomintang Central Committee, Shen Yaqi, who has been kept in the dark, decides to kill Zhao Kang, his first love. The two have a fight in the church, and while Shen Yaqi is hesitating, her henchman Xiao Si kills Zhao Kang.
As the Japanese Emperor prepares to surrender, Shen Yaqi accepts the order from the CCTB and is honored to be the general manager of Shanghai Huitong Bank to take over the CCTB's properties in Shanghai. The Military Intelligence Bureau also sends Cold Ice and Silver Fox to Shanghai to take back the Military Intelligence's properties in Shanghai. In fact, their real purpose was to find the blue file. Shen Yaqi utilizes his position as the general manager of the Huitong Bank to skillfully maneuver with Chilling and Silver Fox, and successfully purchases a batch of medical equipment and a batch of arms for the ****production party. The U.S. Central Intelligence veteran agent Feng Tianjue originally wanted to buy and sell arms, and then follow the trail to catch the lurking in the Central Intelligence Agency and the Military Intelligence inside the **** Proletariat agents, but, as a result, failed to do as hoped, and lost his wife and his soldiers. Feng Tianjue behind the scenes to plan a run on the Huitong Bank, attempting to use this way to defeat the Huitong Bank, to defeat Shen Yaqi, so that she will expose the truth, but Shen Yaqi are able to turn out to be safe. Zhongtong agent He Debiao, Shen Yaqi finally discovered each other's true identity, the two secretly in love. But for the sake of the sacred mission, two people who love each other can not be together.
Chilling forces Matsuda to reveal the hiding place of the blue file, the Kaiyuan Temple on Qinglong Mountain in Suzhou; Matsuda also takes the opportunity to ask for one of his swords, claiming that it is a "souvenir from the Emperor". This secret conversation is bent on getting rich He Debiao's brother He Dekui and Kuai Mazi eavesdropped, but never thought that the secretly recorded secrets were disguised as a bank employee Shen Yaqi's assistant Li Hua. That night, the Kaiyuan Temple, there was a fight, Bing's men Zhu Yishan killed the silver fox beloved Xie Dejin, He Dekui, Kuai Puzi killed Zhu Yishan, took away the "file". However, all of these twists and turns and struggle but all in the Matsuda's cicada shell trick, to the hands of the original is a fake list.
In fact, the U.S. Intelligence Department is really interested in another blue file hidden by the Japanese. Finding this file would lead to the whereabouts of a great fortune. Japan had a Kimberley organization that looted huge amounts of gold and silver jewelry and precious materials in the Philippines, Indonesia and other Southeast Asian countries. On the eve of Japan's surrender, the Kimberley organization prepared to sail back to Japan with three ships carrying this gold and various treasures, but they were discovered on the high seas near Shanghai. The most vicious member of the Golden Lily organization, Japanese Yasuji Yamaguchi, killed all the other crew members and deliberately sank the three ships to the bottom of the sea, and the location of the sunken ships was recorded in the real "Blue File". The real "blue file" is actually a secret chart of where the treasure is hidden. Yamaguchi Yasuji himself took the chart and drifted to the Zhoushan Islands in a lifeboat, and later, Yamaguchi arrived in Shanghai. Matsuda sent someone to assassinate the intelligent monk of the Kaiyuan Temple, so that Yamaguchi Yasuji could impersonate him. And he destroyed the charts after taking them on film. They were going to take advantage of the repatriation of Japanese prisoners of war and expatriates, and Matsuda would bring this film of the charts back to Japan.
He Debian pursued the case, and finally found the real "blue file" in the short sword that Matsuda was wearing. He Debiao and other drive through the enemy checkpoints, the blue file will be handed over to the liberated areas. Unfortunately, he died at the hands of Shen Yaqi's sister, Han Bing. In order to avenge He Debiao's death, Shen Yaqi killed his own sister, Han Bing, a snake-hearted agent who worked for the Junta with all her heart.