The story follows a young girl kidnapped and sold into prostitution who becomes the primary focus of a police chief's investigation when a series of murders occur at the brothel where she works.

Ainu, an unsuspecting young girl, is abducted and sold to the popular Four Seasons brothel run by Madam Chun Yi.

After whipping a defiant Ainu, Madam Chun proceeds to lick the open wounds on the girl's back.

Ainu befriends a mute young man who looks after her in her cell, and begs him to rescue her, but he non-verbally signals that he cannot break her out at this time.

Despite his efforts, Wei is killed in a fire that Ainu started, and the chief doesn't have sufficient evidence to arrest her.

An all-out battle breaks out as Ainu rebels against the brothel, frees the other courtesans, and fights off the guards.

Ainu obliges, but then Chun reveals, with her dying breath, that she sneaked a poison capsule into her mouth which is now eating away at both of their insides.

[1] Rayns noted that though the editing done on the film removed "all its sex and some of its violence by the British censor, its programme-filler origins are still amply evident in its routine caricatures, the all too regular climaxes, the fatuous dubbed dialogue and the patchwork music track.

"[1] Rayns concluded that the result was like an "extended gloss on the moment in Scarlet Empress when Dietrich both trumps and dismisses weaponry with a twist of her veil.