In 626 AD, strange phenomena suddenly occurred in Chang'an, the capital of the Tang Dynasty, and suspicious cases arose everywhere, causing panic among the people. The Dali Temple set up an investigation team to investigate these seemingly bizarre events. The members included Samodora, who was proficient in the art of galo, Qing Lizhi, who had super analytical ability, Huang Sanpao, who was skilled in making gunpowder and operating serial muskets, Gongsun Siniang, who was proficient in all kinds of weapons, Shangguan Zisu, the "human mobile library", and Tan Shuangye, a medical genius coroner. In the series of bizarre cases, the investigation team found out the truth and dispelled superstitions. For example, the villagers of the "Hell Ancient Well" were fleeing from the cursed Dongshui Village; the master and the scholar of the "Thunder God's Judgment Case" were both killed by the Thunder God. As the investigation gradually deepened, everyone gradually discovered that Hei Jialuo was trying to subvert the harmonious Tang Dynasty with despicable means. In the end, evil could not defeat good, and the investigation team completely shattered Hei Jialuo's evil conspiracy. In addition to their unchanging passion and heroism, these young people have a firm sense of responsibility to protect their home and country.