LAM TING-TING gets injured while trying to save an old lady, in the course of which she happens to discover a dreadful murder of four members of the same family. Senior Chemist of the Forensic Science Division KO YIN-POK arrives at the scene. From the bloodstains on the ground he infers that there is still at least a survivor. TING admires him so much for his intelligence and extraordinary powers of observation. Senior Inspector LEUNG SIU-YAU, who has been newly transferred to the Regional Crime Unit, believes that the murderer was aiming for the diamonds kept in the house owner TAM TAK’s safe. POK tries to catch up with the garbage truck to look for the murder weapon. YAU checks out the registration number of the truck and informs POK immediately. POK finally manages to find a knife and some other evidence in the refuse dump. YAU follows Forensic Pathologist KOO CHAK-SUM to the mortuary for the autopsy.… ...