What happens when Elvis meets with Mary Mason?

Mary Mason calls Green's tip line and Elvis goes to see her to follow up on the lead. Upon meeting her, Mary demands four payments of the reward money and says that that is how she does "business." She then tells Elvis that she hears things and that is how she knows the identify of James X, the man accused of kidnapping Susan Martin. When Elvis tells her that there would be no money until a conviction, Mary asks for three thousand dollars for a description. Elvis leaves her home moments later.