Set in the early Republican era, the story follows a policeman with a dual personality who lifts the veil on a series of strange cases. The year is 1911 and China is on the eve of revolution. A series of connected homicides occurs in rural Fuyuan County, a prefecture on the outskirts of Tianjin. Tianjin detective Tan Bodun and his team head there to solve the case. After peeling back the layers of the mystery, he uncovers a shocking secret about Fuyuan County and a struggle between justice and evil begins.