A group of government agents, acting as part of an American-backed conspiracy, release rice stem borers into paddy fields in order to destroy the rice crops. Their aim is to increase rice imports. An engineer named Hamid discovers the plot and informs his friend, Engineer Naderi. Soon afterward, security agents murder Hamid. Engineer Naderi then teaches the villagers how to combat the rice stem borer. The agents also attempt to kill him, but Naderi manages to escape.