Two mismatched Hong Kong police detectives, Yau and Yue, were assigned to work undercover as a live-in couple to track down a serial killer accused of murdering adulterers. In the meantime, Yau (Anthony Chan) is coping with his girlfriend having left him, and Yue (Sandra Ng) is losing her boyfriend to a college girlfriend of his.

• Golden Harvest Productions
• 嘉禾电影有限公司
• Anthony Chan Yau
• Sandra Ng Kwun-Yu
• Carrie Ng
• Michael Chow Man-Kin
• Alfred Cheung Kin-Ting
• Kenneth Tsang
• Teresa Ha Ping