Published in Detective Comics #23, January, 1939, 8 pages.
Day after day, the newspaper headlines cry out about the sudden deaths of dignitaries and celebrities, all from apparent heart attacks. Then a fellow agent of Bart Regan and Sally Norris finds a button from one of the dead men and it turns out to be a microscopically-small radio mechanism that someone is connected with the rash of deaths. Regan and Norris are told to investigate.