Wally Benton, "The Fox," master detective on radio, is about to go with his sweetheart to Niagara Falls in order to get married. Unknown to him, his valet has told a newspaper reporter that Benton is "Constant Reader," someone who has sent information to newspapers about murdered people and where to find their bodies, thus making the police look bad. The police are sure that "Constant Reader" is the murderer himself, since no one else could know all of the details. And so they begin a chase after Benton, a chase which leads to old abandoned warehouses and old abandoned mansions. Wally is being chased not only by the police but also by the real "Constant Reader." Can he save his girl, his assistant, and the reporter and solve the crime before either the villain or the police, who have been told to shoot on sight, kill them all?