This mystery melodrama occurs in the studio of a radio broadcasting station situated on the top floor of the Potter House in Chicago. A murder is committed in the studio during the broadcasting of a certain spiritualistic medium. Everything about it points to another act by the notorious Ghost Gang that has been terrorizing Chicago and vicinity. Through the play's action one hears the formidable voice of Chicago's Police Department broadcasting information and instructions. The warbling of a Junior League Society quartette is interrupted with a robbery. Walter Brokenchild, radio announcer extraordinary, is forced at the point of a pistol to carry on, over the air, even when the studio is held up by desperadoes.