Young Dee Renjie arrives in the empire's capital to join the Supreme Court as police judge of his region. He wants to become a prosecutor. Empress Wu, who is at the beginning of her reign, has commissioned the fierce detective Yuchi to investigate a sea monster that stalks the city at night and makes it unsafe.
Commander Qinglong is the loyal leader of the assassin group that serves the emperor. But when his allies plan a rebellion against the ruler, he finds himself in danger.
