At the beginning of 1950, Chiang Kai-shek was unwilling to be defeated militarily, and in order to overthrow my new red regime and obstruct the international community's recognition of our Republic, he ordered the head of the secret service organization "Notre Dame" code-named "Kamikaze" to use about 50 days from March to May to formulate a major military strike activity called "Thunder Plan". The plan aims to create a series of white terror, blow up the mountain city at the arrival of the May Day parade and rally, so as to weaken the consolidation of our new Republic and have a bad influence internationally.

The "Hongyan" lurking inside the enemy spy immediately informed the Ministry of Public Security of the Southwest Military Region, but he also exposed his heroic sacrifice. The Minister of Public Security of the Southwest Military Region ordered Anwar, the reconnaissance team, to immediately lead the vice captain and Zhou, and fully cooperate with another undercover "spear" of our army to find out the "Virgin Mary", which finally smashed a series of intrigues of the enemy.

At the same time, Ren Baotian, deputy commander and leader of Kamikaze Secret Service, general manager of Jialing Shipping Company, and Zhang Changshui, big shopkeeper of Tianshoutang, respectively received instructions from Notre Dame-the Thunder A project will be launched in the near future, and the plan content is to assassinate Zhou, secretary of the municipal party committee. Ren Baotian, the central spy who has been holding the list of spies lurking in the mountain city, has been at odds with Zhang Changshui, who was born in the military system, because he was excluded by the military system. In order to consolidate his power, Ren Baotian decided to let a man named Yue Feng perform this task. Yue Feng was nicknamed "the lone wolf". This man has a cold appearance and decisive execution as the night wolf. Ren Baotian appreciated the rescue of Lu Zukang, a Kuomintang spy nicknamed "Old Ghost" under the eyes of communist party people. Ren Baotian killed two birds with one stone-he used Yue Feng, who belongs to neither the military nor the centrist, to fight against Zhang Changshui's troops. Regardless of success or failure, the situation will be favorable to him.

That night, "Spear" informed Liu Zhihui of the secret of the Thunder One project. Zhou disagreed with the suggestion and insisted on inspecting the condolence arsenal as planned. We had to arrange a reconnaissance team to escort Zhou closely. And the "old ghost" ambushed on Zhou Bijing's road. A gunshot hit Zhou He, and he and the "old ghost" ran away in a hurry.

When Plan A failed, the Virgin flew into a rage. She entrusted Ren Baotian to trace the reason. It turns out that Zhang Changshui tampered with Yue Feng's sniper rifle with the "old ghost". In fact, Yue Feng knew all about the abacus played by these two men. Seeing that Ren Baotian was about to shoot the "old ghost" as shown by the "Virgin", Yue Feng came forward to protect the "old ghost". The "old ghost" was moved by Yue Feng's loyalty and also saw Zhang Changshui's villain face. After Plan A, the reconnaissance team strengthened its search for troops in the whole fog, and some small spy nests hidden in the corner were emptied one by one. The cunning Notre Dame refused to stop there. She made plans B and C of Thunder in one breath, namely, the bombing of Wudu Arsenal and the Huaying Mountain riots. After careful deployment, Ren Baotian's mistress and female spy nicknamed "Hua" Yu Ruotong secretly carried explosives into the arsenal, but was unexpectedly discovered by Ye, the nephew and daughter of Ren Baotian, the star of the Municipal Cultural and Art Troupe. The "spear" that has been lurking in the dark secretly cut the fuse while Ye was unconscious, thus resolving the crisis.

The reconnaissance team followed the clues indicated by the "spear" to Ren Baotian's home, but found that one of the clues-Ren Baotian's wife Qi Ruyan had been hanged in the bedroom, and the clues were interrupted again; "Hua" Yu Ruotong lingered among Zhang Changshui, Ren Baotian and Yue Feng with ulterior motives; Because of the contradiction with Zhang Changshui, the "old ghost" defected to the Huaying Mountain thief, and a group of spies joined hands with Lao Dalong to launch a fierce attack on the Huaying Mountain office. In the end, under the joint encirclement and suppression of the reconnaissance team and the municipal public security department, almost all the troops were wiped out. The "old ghost" was killed in the encirclement and suppression battle, and the remaining enemy agents fled back to the foggy city.

Notre Dame was furious when she saw that her carefully planned Thunder ABC plan went bankrupt one after another. She ordered the spy "Grey Mouse" lurking inside our army to assassinate Liu Zhigao, and Liu Zhigao and "Spear" and others designed suspended animation to lure the Virgin to get carried away, thus throwing out the final E plan-blowing up the foggy city in the mountain city. At this last critical juncture, the undercover "spear" who has been responsible for infiltrating into the enemy finally appeared. It turned out that he was Yue Feng, the lone wolf, and also the biological son of Hongyan. Yue Feng designed and obtained Ren Baotian's 400-person spy list and gave it to Liu Zhihua. Later, she joined hands with Yang Shuai to kill the "Grey Mouse" and found the explosion site of the "Thunder E Project", but was injured by the "Virgin Mary" in a cave full of explosives. Seeing that this "virgin" was about to succeed, Ye broke into the house. She killed the Virgin without hesitation and helped Yang Shuai and Yue Feng out of the cave.

A sunrise slowly rises on the river, and the revolutionary martyrs start a new day with the fog sheltered by blood and life. Celebrating the founding of People's Republic of China (PRC) and the people's procession and assembly were held smoothly as planned.