Overview:CHAK-LAM believes YAU is innocent. Together with TUK-LAM and SHUI, he goes to the studio again to carry on their investigation. There they witness YING being injured by a knife. SHUI wins a robot for NGAU in a knife-throwing game. Watching him play, she comes to understand how YING was injured. The studio is on fire. YING, CHAK-LAM and the others have a cast-iron alibi – they are in the dormitory when the studio caught on fire. TUNG analyses the case with the trio. The trio follows YING again but she and her younger brother discover them. TUNG and NGAU go to the studio to see how the trio is doing. They are astonished to know that the trio has gone missing. The mother and daughter go to YING’s dormitory at once. As they arrive, YING and GOT are all packed. There is nothing TUNG can do but to ask HON to detain the two. Using a pinwheel, TUNG tries to see if she can see the location where the trio is being kept……