The story took place in Shanghai in the early 1940s, just before the Japanese invaders surrendered. Matsuda Zhao Zhen, director of the Japanese Secret Service, had secretly hidden a list of long-term latent spies named "Blue Files". In order to obtain this list, the Kuomintang C.O. dispatched C.O. agent Zhao Kang, who successfully penetrated into the Japanese secret service Mei organ. At the same time, the Kuomintang Military Bureau also sent military agents Silver Fox and Han Bing from Chongqing to Shanghai to carry out this task.

Zhao Kang, the central agent, sacrificed his reputation and love with Shen Yaqi. He went through many tests with Song Tian, gained the trust of Song Tian and obtained a lot of top secret information. Silver Fox, a military spy, secretly colluded with the Japanese secret service for personal gain, sold information and kept secretly killing China's spies. American intelligence agencies are also salivating at this blue file, and sent a CIA agent Feng Tianjue to collude with Silver Fox in an attempt to steal it. In order to completely smash the enemy's counter-offensive plot and welcome national liberation, our party appointed underground workers He Debiao and Shen Yaqi to pretend to be agents of the Kuomintang Central Committee, and launched a life-and-death struggle with the enemy around the Blue File.

Central agents He Debiao and Shen Yaqi didn't know each other's true identity at first, so they defended each other. When Shen Yaqi first carried out the task of Chinese unification-killing spades K, he performed well and won the absolute trust of Chinese unification. However, when Zhao Kang led the spy to perform the task, he missed the best opportunity to kill Shen Yaqi, which made the Japanese suspicious. Shen Yaqi was also suspected by the Kuomintang and the * * * production party respectively. * * * secret agents of the production party defected to the Kuomintang, resulting in the destruction of many underground organizations of the production party by the Kuomintang. Just when Zhao Kang received an order from the top leaders of the Kuomintang Central Committee to return to China, Shen Yaqi, who had been kept in the dark, decided to kill his first lover, Zhao Kang. They had a fight in the church. As Shen Yaqi hesitated, her fourth grade killed Zhao Kang.

The Japanese emperor was ready to surrender, and Shen Yaqi accepted the order of C.O. and was appointed as the general manager of Shanghai Huitong Bank to take over the C.O.' s industry in Shanghai. The Scout Bureau also sent ice and silver foxes to Shanghai to restore the scouting industry in Shanghai. In fact, their real purpose is to find the blue file. Shen Yaqi took advantage of his position as the general manager of Huitong Bank to deal with Bingbing and Yinhu skillfully, and successfully purchased a batch of medical equipment and a batch of arms for the producers of * * *. Feng Tianjue, a veteran CIA agent, wants to catch the secret agents of the * * * production party lurking in the middle and military system by buying and selling arms. As a result, he failed to do it and lost his wife and soldiers. Feng Tianjue planned to run Huitong Bank, trying to defeat Huitong Bank and Shen Yaqi in this way and let her reveal the truth, but Shen Yaqi was able to save the day. The Central Committee of the Communist Party of China agents He Debiao and Shen Yaqi finally discovered each other's true identity, and they fell in love secretly. But for the sacred mission, two people who love each other cannot be together.

The ice forced Song Tian to give up the blue file hiding place-Kaiyuan Temple in Qinglong Mountain, Suzhou; Song Tian also took the opportunity to retrieve one of his own swords, claiming that it was a "souvenir of the emperor". This secret conversation was overheard by He Dekui, the younger brother of He Debiao who was bent on making a fortune, and Kuaimazi. Unexpectedly, the secretly recorded secret was concealed by Li Hua, the assistant of Shen Yaqi disguised as a bank employee. That night, there was a gladiator in Kaiyuan Temple. Zhu Yishan, a soldier, killed Sedijin, the confidant of Silver Fox, and He Dekui and Kuaimazi killed Zhu Yishan and stole the "files". However, all these twists and turns and struggles were deceived by Song Tian, which turned out to be a fake list.

In fact, what the American intelligence department is really interested in is another blue document hidden by the Japanese. If you find this document, you will find the whereabouts of a large fortune. A Japanese Jin Baihe organization plundered a lot of gold, silver, jewels and valuable materials in the Philippines, Indonesia and other Southeast Asian countries. On the eve of Japan's surrender, Jin Baihe organized three ships to carry these gold and various treasures back to Japan, but they were found on the high seas near Shanghai. Yasuji Yamaguchi, a member of the most ferocious Jin Baihe organization, killed all the other crew members and deliberately sank three ships to the bottom of the sea. The real "blue file" records the location of the sunken ship. The real "blue file" is actually a secret chart about the hidden place of the treasure. Taiji Yamaguchi took the chart himself and went to Zhoushan Islands in a lifeboat. Later, Yamaguchi arrived in Shanghai. Song Tian sent someone to assassinate the wise monk of Kaiyuan Temple, and let Yasuji Yamaguchi be an impostor. The chart was photographed and destroyed. They are going to take the repatriation of Japanese prisoners of war and expatriates as an opportunity, and Song Tian will bring this graphic film back to Japan.

He Debiao pursued him and finally found the real "blue file" in the dagger that Song Tian carried with him. Time is pressing and there is no time to delay. He Debiao and others drove through the enemy checkpoint and handed over the blue file to the liberated area. Unfortunately, she finally died at the hands of Shen Yaqi's sister Bing Bing. In order to avenge He Debiao, Shen Yaqi killed her sister Bingbing, a snake-hearted spy who worked hard for the military system.