In 1958, the country was in dire straits.Patriot scholar An Wenshan is an expert in nuclear technology and hopes to return to serve his country.However, he was controlled by enemy agents on his way back home. He handed the research data to Ji Danyang, a doctor of mathematics, and asked him to take it back home.The military intelligence department received the news and sent a special operations team to Hong Kong to intercept Ji Danyang.The Ministry of Public Security sent police officers to Hong Kong to escort Ji Danyang back to China, codenamed “ Operation Magpie Bridge ”.The public security officers took the Wilson cruise ship to Hong Kong, and they were still thirty minutes away from their destination.​

Ji Danyang saw a man wearing a navy blue peaked cap holding his name tag, but he remembered that An Wenshan said that the man who came to pick him up was wearing a black peaked cap, and he realized something was wrong.Ji Danyang pretended not to recognize the man, carried his suitcase and continued to move forward, with the enemy agents following closely behind.Suddenly an ambulance appears, a shootout breaks out and chaos reigns in the streets.Ji Danyang took advantage of the chaos and fled.After the connection failed, Ji Danyang followed An Wenshan's instructions to the hotel for a second connection.Ji Danyang came to the hotel lobby, and a woman reminded him to pay attention to safety. The hotel was full of ambushes.The woman Pang Hongmei invited Ji Danyang to dance, but he doubted her identity.

Pang Hongmei tried to take him away, but was shot. Another woman took the opportunity to escape with Ji Danyang.Pang Hongmei knocked out the spy who threatened her and pursued Ji Danyang but it was too late. Ji Danyang was taken to room 606 by a woman.The woman deliberately sprinkled the water, pretending to miss it, and discovered that the notebook was not the information.Ji Danyang lied that the information was in his room and gave the woman the key to her room.Ji Danyang took the opportunity to escape and was caught by Pang Hongmei.Pang Hongmei explained that the woman was a spy and vowed to protect Ji Danyang and the information.The female agent found the information and found that Ji Danyang was missing, so she searched for him.Pang Hongmei met the female agent again. The female agent threatened Ji Danyang with a gun, and Pang Hongmei put down the gun.Ji Danyang understood that Pang Hongmei was the connector and gave the gun to Pang Hongmei.The female agent shot and wounded Pang Hongmei, and Pang Hongmei covered Ji Danyang's escape.Ji Danyang ran far away and looking back at what had just happened, Pang Hongmei found him and took him to the resettlement site.

Ji Danyang bandaged Pang Hongmei's wound, and Pang Hongmei suggested not to rush and continue to search for information.Ji Danyang hid the real information in the cabinet in the corridor.Pang Hongmei escorted Ji Danyang through Luohu Gate early in the morning. The whole process took thirty minutes.Minister Chu and the director of the Ministry of Public Security had been waiting opposite for a long time, paying close attention to every move of Pang Hongmei and Ji Danyang.They still have five minutes to clear the level.A female spy brought Ji Danyang's photo to the foreign detective at Luohu Port and put pressure on him, both soft and hard, and the detective immediately ordered the gate to be closed.Pang Hongmei and Ji Danyang passed the security check smoothly. They quickly walked to the other side. The detective ordered the gate to be closed. It was too late for the female spy to stop them.Minister Chu warmly welcomed Ji Danyang's arrival, but Ji Danyang suddenly lost his voice due to unexpected pressure.Minister Chu sent Pang Hongmei to escort Ji Danyang to Lumen, Xichuan, and arranged for others to secretly protect them both.Ji Danyang and Pang Hongmei got on the train to Lumen. Pang Hongmei temporarily kept the briefcase containing the information and followed Ji Danyang closely, not allowing him to have contact with anyone.