Jill, nubile daughter of a polite demimondaine, gets mixed in with jobless Jack Galbraith, whose time is spent begging for a pension and hoping to win public prize competitions .
A charming, competent demimondaine blackmails her way into the business, putting it on a wholesale basis through the post.
Never give your heart to a demimondaine: she'll chew it up and spit it out.