In the 17th year of Zhenyuan in Chang'an, the translator died tragically in Xishi. The bronze talisman of the Xi clan, the secret triangle sign, and the remaining paper from Baqiao led to the mystery. Su Jingming, the judge of Dali Temple, was appointed in a critical situation. He needed to find the missing messenger and solve the murder case for three days, but he encountered a second-generation official who disrupted the situation and kidnappers set a trap. In Chang'an, where conspiracies are surging, can he uncover the real murderer within the time limit and protect the peace of the Tibetan people? If the time traveler disrupts the situation, how will things develop?