From the June, 1960 issue of short story anthology Argosy, reprinted in Q.E.D. as “Mystery at the Library of Congress,” Ellery is introduced to lateral clues: the FBI know messages are passed via book titles in the Library of Congress. The titles and authors point to the varying contact. For instance, the surnames authors Steve Allen, Leo Tolstoy and Sigmund Freud point to the “FAT” man sitting elsewhere in the library, and Ellery has just minutes to determine which person in the library fits the description of the patron who can be identified buy the authors William Shakespeare, George Bernard Shaw and Ulysses S. Grant. Spoiler hint: that days’ contact was the patron portrayed as a parody of Fidel Castro.