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.