A team of scientists conducting a biological study in the underground sewage system discovers a group of alien-looking eggs that they subsequently destroy. However, unknown to them, one of the eggs had hatched and escaped. It is a snake-like creature that can adapt quickly to human society, and it soon adopts human form. As a beautiful woman, the snake creature seeks food, and a way to fertilize her eggs.
With Hong Kong on the brink of unification with the Mainland, can they get along? When the Beijing police want to arrest his brother for murder, Hong Kong lawyer Shen goes to Beijing to help. Time and again he butts heads with differences between Hong Kong and Mainland law and practice. Thanks to a persistent though traditional lawyer named Wu and an implacable but fair policewoman named Lan, Shen manages to keep out of jail and pursue his brother's innocence. The big problem is that the dead man, a pimp and a bully, is the son of a wealthy and influential man who'll stop at nothing to avenge his son's death.
