The play tells a short story of a secret communication line created by our party in transmitting information, escorting staff, transporting materials and supplies, and completing the strategic transfer of central state organs and units from Shanghai to the Central Soviet Area.

In order to better help the Central Soviet Area get rid of the national defense "encirclement and suppression" and economic blockade of the National Government, the CPC Central Committee decided to open a bright red traffic line from Shanghai to the old revolutionary base areas via China, Hongkong and Shantou.

Zou is the stationmaster of Bogongwa Station on the traffic line. Together with other traffic policemen, he completed the top secret task of transporting workers and urgently needed materials to the old revolutionary base areas, and also completed the task of transporting budgets and transmitting information from the old revolutionary base areas to the Shanghai Party Central Committee. Under the leadership of Zou, the correspondent fought with his opponent.

Following the severe investigation and punishment by the military agents of the National Government with Cao Ruiying as the stationmaster, many stations were destroyed by their opponents, but the correspondent swore to defend them to the death and defended the party's secrets with his blood and life.

In the process of escorting 100 delegates from all over China to attend the Second National Congress of China and the Soviet Union in Ruijin, Zou and others, regardless of others, blazed new trails and escorted all delegates to Ruijin safely, thus ensuring the extremely important Second National Congress of China and the Soviet Union to be held as scheduled.