On orders from the command, the wife of the commander of the 4th Army, Hua Xiaofeng, infiltrates enemy lines to establish contact with an underground organization and rally the masses to take up arms against the Kuomintang. Under difficult conditions, risking her life, the young woman carries out her combat mission. The red seeds she sows among the people sprout—the peasants help the 4th Army defeat the Kuomintang.