During the fourteenth year of Tianbao, undercurrents surged in Chang'an during its prosperous period. When Li Muyun, the Sogdian translator, was translating a secret letter from the caravan at Honglu Temple, he glimpsed clues about the unusual movement of weapons in the Western Regions; Fanyang wolf guard An Chengsi escorted the tribute to Beijing, and the map of Youzhou and the secret treaty with the Turks hidden at the bottom of the box tore open the "loyalty" The blood-red puzzle of "Chen" Anlu Mountain; and Pingkangfang pipa master Su Wani, a phoenix-necked pipa with a hidden map of Yumenguan Fortress, and a song "Liangzhou Breaking Formation" that shattered the glass lamp, pushed her identity as an orphan of the Sui Dynasty into the abyss.
The fate of the three people is intertwined because of a missing imperial seal - the Mohist astrolabe is hidden in the seal, which can predict natural disasters, control the Western Regions, and even affect An Lushan's rebel cavalry. Li Muyun used the Sogdian trade route as a network to pass on the secrets of the rebel food routes to Shuofang's army; An Chengsi pieced together the truth about Anlu Mountain's massacre of his own people in the chaotic memory of the soul-leaking syndrome; Su Wani used Lefang silk and bamboo as a blade to destroy the rebel war horses with the Kucha sound array, and under the ruins of Xingqing Palace, used broken string resonance to open the secret passage of Xuanwu Gate...
From the dust-filled Suiye City to the blazing Daming Palace, from the flesh-and-blood millstones of Xiangji Temple to the pear blossoms and white silk of Mawei Station, power and betrayal are biting and growing on the bones of the prosperous Tang Dynasty. When An Chengsi and An Qingxu perished together in the flames of Yecheng, and when Su Wanni walked into the yellow sands of the Western Regions with a broken pipa in her arms, only Li Muyun understood fate among the cracks in the star track of the national jade seal: the wars of these troubled times are just a sad chord in the cracks of history that no one has fully listened to.
