Summary A body falls from a height and Sing Pak deduces that the murderer has killed the victim with extreme cruelty. Pui Ching is renting a high-class apartment due to home maintenance, but it turns out that Hak Nam is living in an old tenement building which is in a poor condition. One after another, Pui Ching and her neighbor Ying Wai witness one of the murders. Po-Ying realizes that the three cases are related and suspects that she has found the murderer's killing pattern. Pui Ching remembers Hak Nam's words and suspects that the murders may be related to the Tong Lau, so she goes there to find out more. Hak Nam takes care of a sick old man who refuses to take medicine and wants to die. ...... Pui Ching finds something on the rooftop wall. .

• Crime