Posing as a prostitute, a moral housewife penetrates the underground sex-trade in order to find her missing gigolo son.

Whatever. It's a good premise. However it's definitely a R rated concept, bordering on NR-17 which may limit its box office potential.

Agree... it's a hook... it hooked me... job well done I say

A ticking clock would be nice--greater urgency.

What if she was a successful artist or write or owned her own business rather than just a housewife? Now she's risking her reputation and career as well as everything else to find her son. She has more to lose if she fails -- or even succeeds in rescuing her son but everyone finds out what she did. More complications = more possibilities for conflict and dilemma.