Chief inspector of Hong Kong’s Criminal Intelligence Bureau, Cheuk Hoi, is suspicious of his close colleague’s mysterious death. Adding to the enigma, he discovers that the five undercover agents who were in constant contact with his dead friend have all vanished.

• Raymond Lam Fung
• Ma Kwok-Ming
• Benz Hui Shiu-Hung
• Michael Miu Kiu-Wai
• Benjamin Yuen Wai-Ho
• Sisley Choi
• Owen Cheung
• Priscilla Wong