In order to save his daughter's life, the professor decides to help LAI-HIM in developing his biochemical weapon. After developing the biochemical weapon and the antidote, LAI-HIM decides to carry out his plan. He invites YAU-CHING and YIP TING to join him as well. YAT-KA escapes from the room by making use of her expertise and she discovers the biochemical weapon's data file in LAI-HIM's computer. CHI-NGO returns to ATF to lead the team in fighting against the Scaredy Bird. The terrorists sneak into the shopping mall. YIP TING and YAU-CHING are involved in it as well. They are asked to put two time bombs inside the shopping mall's ventilation system respectively. YAU-CHING subdues the terrorists successfully and CHI-NGO's people arrive at the shopping mall to help him. The terrorists bring YIP TING to the rooftop and hang her with the time bomb……
