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.

• Michael Miu Kiu-wai
• Benz Hui Siu-hung
• Benjamin Yuen Wai-ho
• Priscilla Wong
• Raymond Lam Fung
• Kenneth Ma Kwok-Ming
• Mandy Wong
• Sisley Choi Si-pui