1920s Broadway. Playwright David Shayne considers himself an artist, and surrounds himself with like minded people, most struggling financially as they create art for themselves, not the masses. David, however, believes the failure of his first two plays was because he gave up creative control to other people who didn't understand the material. As such, he wants to direct his just completed third play, "God of Our Fathers", insider scuttlebutt being that it may very well make David the toast of Broadway. With David having no directing history, David's regular producer, Julian Marx, can't find any investors,... until a single investor who will finance the entire production comes onto the scene. He is Nick Valenti, a big time mobster, with the catch being that his dimwitted girlfriend, non-actress Olive Neal, get the lead role. A hesitant David and Julian, who are able to talk Nick into them giving Olive one of the two female supporting roles instead, go along with the scheme hoping ...