When Sally shows up at Sterling Cooper Draper Pryce, she wears a Spring flowery Vera style shift dress and she brings with her Nancy Drew and The Clue of the Black Keys.
Published in 1951, the mystery is the 28th in the Nancy Drew series, and once again, Nancy stumbles onto a mystery as she tries to locate an archaeologist who disappeared with the clues to a buried treasure. This mystery involves a sea captain grandfather’s old diary, Central American antiquities, a hidden island in the Florida Keys, a cipher carved in a stone tablet and three black keys.