In 1929, a series of arson attacks and strange poisonings occurred in the Zhangjia Grain Store. Japan's Mitsui Trading Company used Taihe Trading Company to set fire to stockpile grain and control grain prices, in an attempt to strangle the lives of the people through commerce and war. Detective Guan Qingtian, businessman Gao Xiuxuan, doctor Cui Niang and Father Frank teamed up to break the cyanide poison plot, destroy the secret agent's secret room, dismantle the explosion conspiracy, guard the granary with flesh and blood, crush the Japanese army's plundering ambitions, and safeguard the food security of thousands of families and the hope of the country.
