During the anti-Japanese war, truck driver Lee Sing's secret mission is to transport weapons and supplies for the resistance fighters. Sing has to deliver a signal gun to guerrillas at ten on that night for launching an attack against the Japanese soldiers. He works for the Ko's family and he has to send the gun to the provincial city to prevent it from being bombed. Sing carries on his vehicle a group of passengers including a Chinese traitor, a guerilla, a compassionate nurse, a comfort woman on the run, a teacher and his pregnant wife. Sing is given a hard time by the Japanese troops on the road. The Japanese ransack the vehicle and they find the signal gun. All the males on board are being interrogated with torture, but the passengers pool their efforts to subdue the traitor and accomplish their mission.

A traitorous businessman conspires with commanding officers to sell military supplies to the enemy. The plan is discovered by a group of poor but righteous people led by Lui Pang (Cheung Ying), who join hands with the guerrilla group to foil the plot. While making a harsh statement on those who exploited the national crisis to get rich, Tang Xiaodan portrayed vividly the sorrow and joy of the working class as well as an altruistic utopianism. The film begins with a song by Leung Mo-sik that describes the severity of war and the hardships endured by common people, intercut with real footages from war zones. The anti-war sentiment of the film is less political in nature and imbued with grave and genuine concern for the poor.