The play tells the story of Professor Xiao Anbang, a patriotic geologist, who returned to China to establish a geological research institute at the behest of the National Government. After five years of hard exploration, an iron ore vein was finally discovered in Inner Mongolia. Sun, a mining tycoon, was appointed by the Ministry of Industry to mine iron ore. Unexpectedly, on the eve of signing the contract, michael brown, a member of the geological exploration team, was mysteriously killed and the geological data kept at home was stolen. The case fell to Peng Fang, inspector of the patrol room.

On the eve of signing the mining contract, Sun died mysteriously and the iron ore data disappeared again. Who killed Sun? Peng Fang found that all doubts pointed to Du Fu. Peng Fang found the hidden cuckoo, and two lovers pulled out their guns and finally confronted each other with their true colors. Rhododendron, a Japanese, was brought to China by his father in his early years. Du Fu, pretending to be Du Xiaoyun, lurked in the central core with only one purpose, that is, to hold iron ore in Japanese hands before Japan formally invaded China. Peng Fang can't believe that the woman he loves is so vicious. Du Fu sneered, she is Japanese, even if she dies, she will finish the task and be loyal to the emperor. Peng Fang pulled the trigger, the bullet went through the cuckoo's heart, and the cuckoo fell in a pool of blood …

In the late 1920s, Peng Fang, who was inspecting the public concession in Shanghai, was involved in a complicated case because of a series of serial murders. Kong Peizhi, Minister of Industry of the National Government, sent Du Fu, a confidant, to Shanghai beach in an attempt to destroy the iron ore mining plan just led by geologist Xiao Anbang, with the intention of hoarding iron ore and raising the price to enrich himself. Unexpectedly, the discovery of this large-scale iron mine has aroused the covet of Britain, the United States, Japan and other multinational powers, and all parties have tried to seize the right to mine iron ore by hook or by crook. Peng Fang gradually found the biggest black hand who intended to grab iron ore-the Japanese. In the end, with the help of a group of patriots such as Qian Feifei, Peng Fang found Kong Peizhi to enrich himself, killed Du Fu, who was actually Japanese, and protected the iron mine.