When Emperor Xian Feng (1831-1861) favourite concubine Cao died, he had her secretly buried in a huge cavern of the remote Qing Gang Mountains. Rumour has it that the "Eternal night-shining Pearl" was buried with her. About 20 years later it appears that 1 of 8 palace maiden, chosen to follow her to the death, escaped and is now most wanted by a bunch of unscrupulous bandits, who want her to lead to them to that hidden location. They encounter unexpected resistance, when they are opposed by a quintet of women fighters and a male government official.

Wandering endlessly between pure incoherence and a tragedy rife with dramatic possibilities, Lau Kwok-Hung sets up the murder mystery of a, low and behold, killer who strikes during rainy nights.

Three wrongly convicted criminals escape from prison.