Customs squad captain Yung Sing-yip is tipped off about female drug lord Fung Ku, the ‘Shark of the Pacific’, but is ambushed and captured en route. Beautiful yet ruthless, Fung fails to coerce him into helping her crimes, only for attraction to grow between them. After becoming pregnant, she still refuses his plea to abandon the gang. Meanwhile, Yip befriends nightclub singer Chan Siu-lin after rescuing her from thugs. Furious when Fung secretly has an abortion, he steals the gang’s roster and prepares to expose them. Fung catches up with him but cannot bring herself to kill him; turning on her own men, she is shot dead, allowing Yip and Siu-lin to escape.