The Detective: Ho Pui-lan was the secretary of the writer Wu Him, but she died suddenly at home. Ho's mother commissioned private detective Chan Kin-chau to investigate and found out that Pui-lan and Him were having an extra-marital affair, and also discovered that the contents of Him's fiction were similar to the contents of Pui-lan's suicide note. When Kin-chau finds out that the contents of Him's fiction are similar to the contents of Pui-lan's suicide note, he and Pei Lan's sister Yuk-lan reenact the murder case, and Him is stimulated and hallucinated to reveal the truth of the murder...