During the War of Resistance Against Japan, the National Government was divided and various domestic forces fought against each other.

In 1942, many personnel from the Wang Puppet Government and the Japanese Army were assassinated. The head of the secret service agency Takeda was about to return to Japanese Army as a crime, but he was unwilling to accept it.

Takeda analyzed the assassination incident and learned that there was a spy under the command of the old gun in the Wang Puppet Government's Bandit Suppression General Command, so he wanted to find the old ghost and the old gun in order to make meritorious service.

Takeda designed fake intelligence and induced the revolutionary organization to carry out assassination activities in Baicaotang, and put five relevant staff members under house arrest in Qiuzhuang during the intelligence flow.

They are Bai Xiaonian, the commander-in-chief of the bandit suppression, Jin Shenghuo, the director of the Military Machinery Department, Wu Zhiguo, the leader of the bandit suppression team, Li Ningyu, the leader of the translator group, and Gu Xiaomeng, the translator.

Faced with the interrogation group between the head of the secret service agency Takeda and the director of the secret service agency Wang Tianxiang, the five people felt that the situation was serious.

The old ghost wants to pass the information out of the blocked Qiuzhuang, stop Takeda's conspiracy, and protect the organization from destruction.

Wang Tianxiang asked the five people about their opinions on the old ghost.

Revealing the identities, backgrounds, personalities and relationships of 5 people.

Takeda made the suspicion between the five people public.

Five people in the restaurant had an argument and their relationship became tense.

Takeda collected the handwriting of five people, compared with the materials of Lao Gui, and locked in the commander's male favorite Bai Xiaonian.

He took Bai Xiaonian away for interrogation late at night. Bai Xiaonian claimed that he had been framed, so he was tortured by Wang Tianxiang.

The commander came to hold him accountable, but was questioned by Takeda. In order to prove his innocence, he personally interrogated Bai Xiaonian. The interrogation was fruitless and pointed the suspicion at the calligraphy master Jin Shenghuo, who died of Bai Xiaonian.

Takeda interrogated Li Ningyu and threatened Li Ningyu's spirit because of the capture of her boyfriend Liu Linzong. The interrogation failed to make progress.

At the same time, Wu Zhiguo broke into Gu Xiaomeng's room. Wang Tianxiang learned about Wu Zhiguo's violence against Gu Xiaomeng through the monitor. Afterwards, he came to comfort him and said, "I have been there."

Two days before Takeda was sent back, Takeda was eager to catch the old ghost and old gun.

Flashback: Takeda was ridiculed by the lieutenant general for his family's weakness at the military meeting, and stabbed the lieutenant general in anger. This is the reason for being sent back to the country.

Takeda used the underground organization members who came to investigate the situation to hold a banquet for 4 people, with the goal of observing their performance.

He was keenly discovered that Wu Zhiguo and Gu Xiaomeng deliberately avoided it, so he locked in the old ghost among these two people!

That night, four people gathered and threatened Bai Xiaonian's body. Jin Shenghuo couldn't bear the pressure and raised his gun to commit suicide.

Li Ningyu was sent back to the room, causing Wu Zhiguo and Gu Xiaomeng to be alone in the cell. While the surveillance of Takeda and Wang Tianxiang, Gu Xiaomeng reported Wu Zhiguo again, and Wu Zhiguo abused Gu Xiaomeng, intending to kill him.

After saving Gu Xiaomeng, Takeda got her cigarette with a telephone code at the banquet.

Wang Tianxiang interrogated Wu Zhiguo, who was the most suspicious, and went through severe punishments.

Back in the room, Li Ningyu cheated out her identity as an old ghost from Gu Xiaomeng, and Gu Xiaomeng showed up. The two had a deep relationship, and Gu Xiaomeng entrusted Li Ningyu to report him.

Wu Zhiguo's life was hanging on the line. Li Ningyu appeared and reported Gu Xiaomeng to save the dying Wu Zhiguo. Wu Zhiguo was quickly sent to the hospital for emergency treatment and hummed a shadow puppet on the operating table.

Wang Tianxiang's interrogation of Gu Xiaomeng failed. Takeda threatened his family's life, so Gu Xiaomeng pretended to submit and waited for an opportunity to attack Takeda, but was shot dead by Wang Tianxiang.

The old ghost is dead and cannot find the old gun, so Takeda cannot take credit.

The commander came and held Takeda responsible for his unselfish punishment. The two chose to kill Wang Tian Xiangding.

Takeda and the commander were waiting for the rabbit in Baicaotang. The underground revolutionary organization seemed to have received the information and had given up its action.

Takeda was waiting for his return home at the pier and was assassinated. The killer was Wu Zhiguo.

Ending: Japanese and Benzene surrendered, the War of Resistance ended.

Wu Zhiguo found Li Ningyu, a female textile worker, to tell her the truth, and asked Gu Xiaomeng for the cheongsam.

Flashback: When Wu Zhiguo raped Gu Xiaomeng, he actually secretly revealed the identity of the revolutionary; when he was alone in the cell, Wu Zhiguo showed his identity as an old gun and arranged for Gu Xiaomeng to reveal himself to protect Gu Xiaomeng; in the hospital, Wu Zhiguo hummed the empty city plan and passed the information to the comrades among the nurses; Gu Xiaomeng had already sewn the information on his underwear and passed it out with the corpse.

Li Ningyu interprets the message on the cheongsam.

Gu Xiaomeng: Whether the message is coming out, success or failure is today. I am not afraid of death. What I am afraid of is that those who love me don’t know why I died. I am in purgatory. I only hope that my family and Sister Yu forgive my decision at this moment. But I firmly believe that you will understand my mood. My dear, I am so ruthless to you. Just because the nation is about to survive and die, we can only do our best to save and save. If my body is about to die, but the soul will be with you. The enemy will not understand. Old ghosts and old guns are not individuals, but spirits and beliefs.

Li Ningyu looked back at Gu Xiaomeng who was sewing clothes.

The movie ends!
Chapter completed!