Traveling back in time to a Tang Dynasty official who was captured by the rebels during the Anshi Rebellion, Lu Wenye found that he could "hear" the sounds left by history on old objects - the miserable howl on a rusty knife, the heartbeat on a secret letter, and the general's orders on a war drum. With this ability of "listening to the past", he was caught between the Tang Dynasty and the Yan army, from a slave who copied documents for the rebels to the master of the empire's most mysterious intelligence center - "Tian Ting Si", using his forgotten voice to rewrite the written history.
