When the Night Falls (1997)

Eve, a sensual and dangerous brunette, is the prime suspect in the robbery of information from her boss office. To catch her the boss hires a private dick to find out more details about the double life she leads. The detective discovers that, even though she's a sweet and efficient secretary by day, when night falls she transforms herself into a recruiter of prostitutes to serve the needs of a secret society known as The Golden Phallus. The sect draws the gumshoe to its bordello and it's nefarious matriarch, Maeva.