National Day at ten o'clock

September 1953, a certain provincial city. Our public security agency received a notification from the enemy that the enemy was planning to create an explosion on National Day. After accepting the mission, detective Gu Qun (played by Yin Zhiming) immediately visited the people to learn the clues to solve the case. Agents He Zhanbiao (played by Puke) and Bai Songting (played by Li Jie) used methods such as secretly sending anonymous letters and causing traffic accidents to frame the driver Ping Xiaohai (played by Zhao Lian) at the reception desk, diverting the investigation direction of the public security personnel, and fishing in troubled waters. Naughty (played by Ma Shida), a primary school student, never dreamed that a time bomb was planted in the alarm clock he liked to play with. The explosion time was at ten o'clock in the morning on National Day. After committing the crime, He Zhanbiao tried to escape on a train, but was captured by Gu Qun. At the same time, Ping Xiaohai's girlfriend Zhao Xiaohui (played by He Xiaoshu) was helping Xiaohai recover from the distress of being framed. In the interrogation room, He Zhanbiao stared at the clock on the wall. Ten o'clock passed and the bomb did not go off...