The film is adapted from "Hawthorne Detective Cases" by Chinese detective novelist Cheng Xiaoqing. It tells the story of a wealthy and mysterious city on the Sino-Russian border - Golden City, where a bizarre murder occurred. The confusing clues and unidentified people made Hawthorne's investigation journey full of unknowns and obstacles. The biggest suspect - the thief Jiangnanyan's superb disguise skills made the whole case even more complicated. Can Hawthorne find out the truth and get out of the crisis unscathed?