Originally published only a year after the fair ended, "World's Fair" brought to bear recent memories when released. By the time Grosset &amp; Dunlap acquired the Beverly Gray series in 1938, however, the Chicago World's Fair was receding further into the past and preparations had begun for the 1939–40 New York World's Fair. "Because [Beverly Gray at the World's Fair] specifically referred to the Chicago Fair and work on the New York Fair was underway," Blank's editor wrote to her in a 1941 letter, "we felt that readers might be disappointed to discover that Beverly had been to the old fair – not the New York one." As a general policy, her editor went on, when Grosset foresaw "a long and steady sale," it sought to "avoid having anything in the stories that might date them." This policy would not prove to withstand the entry by the United States into World War II, but was sufficient to end publication of the original sixth work in the Beverly Gray series. The original seventh and eighth works, Beverly Gray on a World Cruise and Beverly Gray in the Orient, were renumbered 6 and 7. Beverly Gray on a Treasure Hunt, the first work published by Grosset, became book number 8.