A locust plague that was rare in a century has invaded the land of Wuzhou. Empress Wu Ze Tian orders the delivery of relief money to the disaster area, but on the way, tens of thousands of taels of silver are robbed and disappear into butterflies. Detective Dee has ordered his personal assistant Zhao Yuan Zhen to investigate the case while he himself sneaks into the civil investigation on the streets. In the process of investigating the case, they encounter a suspect, Guan Xiao Qi, who needs to prove his innocence, and they are caught in a difficult situation when the relief money is robbed again. The case of the butterflies is a mystery, and the dynasty’s power and intrigue are raging.