In the early years of the Republic of China, the corrupt Qing government was overthrown by the revolution, and the trend of democratic progress quickly swept across the land of China. However, the chaotic situation and the lack of wisdom of the people, ignorance, backwardness and feudal superstition still filled China at that time. A strange thing happened in the Chen family mansion in Heishui Town. Li Xiangling, the fourth concubine of Chen Facai, died strangely at home. On the night of Li Xiangling's death, her personal maid Xiaolan suddenly sang a song, which turned out to be Li Xiangling's favorite song during her lifetime. Xiaolan's posture and tone when singing were exactly the same as Li Xiangling in the past. Everyone talked about it, saying that the maid Xiaolan was "taken away" by Li Xiangling's wronged soul. Since then, strange things have continued in the Chen family mansion. Everyone in the house privately attributed Li Xiangling's death to her breaking taboos and bringing bad luck upon herself. However, the young detective Wang Zhizhang disdains the supernatural and chaotic talk. He believes that everything that happened in the Chen family mansion must be someone playing tricks. Previously, Wang Zhizhang had received many missing persons cases, and these missing people were more or less related to the Chen family mansion. In order to further find out the secrets of the Chen family mansion, Wang Zhizhang decided to go to the Chen family to find out. According to the previous information, Mr. Chen was superstitious and stubborn. Wang Zhizhang took advantage of Chen's superstition to disguise himself as a Taoist priest and successfully sneaked into the Chen family. However, when Wang Zhizhang entered the Chen family mansion, he found that the atmosphere here was depressing. Mr. Chen's family law was strict and he often punished the servants. From the housekeeper Chen Zhong who took care of all the sundries for the Chen family to the chef Baoshan, the servants of the Chen family did not even have the basic dignity of being a human being, and they all succumbed to the tyranny of Mr. Chen. Everyone in the mansion was worried and had their own ulterior motives; it seemed that everyone had their own secrets that could not be seen in the light. Although the Chen family members are not in harmony, they all follow the family rules of the Chen family - no one in the mansion can go near the ancestral hall. However, the fourth concubine had been to the ancestral hall before her death, and Wang Zhizhang felt that there must be something strange in the ancestral hall.