The Qiu family, who are very prominent in society, are preparing for a grand engagement party. However, an unexpected guest, Agent Jia (played by Louis Koo), suddenly arrives and brings with him the suicide case of a young girl, Zhang Xiaojuan, which breaks the happy atmosphere of the Qiu family. From the master (played by Eric Tsang), his wife (played by Teresa Mo), the young master (played by Lam Ka Tung), the young lady (played by Karena Ng), to the housekeeper (played by Law Lan), all of the Qiu family members said that they had never known Zhang Xiaojuan. Unexpectedly, Agent Jia used a diary and a photo of the deceased to tear off the gorgeous skins of the Qiu family members one by one, revealing that everyone has a great connection with the deceased! A gorgeous century banquet is held as scheduled. In the midst of joy, will the visit of this agent completely affect the Qiu family's century banquet? The movie is adapted from the famous British stage play "An Inspector Calls".