Famous female detective Huang Zixian, became a wanted murderer who poisoned the whole family overnight. She fled from her hometown to the capital with her grievance, and she encountered Li Shubai, the Duke of Kui, on the way. Then she dressed as an incognito eunuch with the help of Shubai at the royal palace. They were involved into many mysteries and together deal with the intermittent clues behind the strangeness. At the end of all the bizarre suspense, the truth was enough to topple the whole dynasty.