John Fok (Eason Chan) is the kingpin of illegal red oil in Greater China. When an oil tanker explodes accidentally, he becomes the focus of investigation by Hong Kong and Mainland Chinese police and is forced to halt his business to wait thing out. Just as he is finally ready to turn his fortune around, however, his only son is kidnapped.
Senior Inspector Molline Szeto (Sammi Cheng) is the rising star in the police force, who is well praised for busting crime with her characteristic sangfroid and precision. However, in matters of love, she is totally at wit's end. Poised at the crossroad of her life, she is thrilled to be assigned to investigate the kidnap of John's son. An unlikely cooperation between cops and crooks thus ensues, leading to conflicts and clashes galore at every step till the end.