In 1937, three of the illustrations were eliminated, leaving only a frontispiece, and additional information and illustration were added to the dust jacket. In 1943, the interior frontispiece art was updated to conform to current 1940s style. In 1950, the dust jacket was revamped as a wraparound jacket, with the picture continuing onto the spine of the book, and with cover art by Bill Gillies that was more in keeping with 1950s style. Gillies' Nancy, modeled after his wife, looks more mature than 16 (her age in the text at the time). She wears a 1950s version of her early trademark blue suit, and is kneeling so that the length, width, and general style are indeterminate, leaving the art less dated. The scene does not exactly match the text in the story.