Clue of the Black Keys by Carolyn Keene Nancy Drew #28 Blue Tweed Cover 1951
Clue of Black Keys by Carolyn Keene. New York. Grosset & Dunlap. 1951. Reprint. Hardcover. Very Good with no dust jacket. Edgewear. Blue tweed cover with blue multi endpapers. Nancy Drew Mystery Story Vol. 28. Black and White Illustrations. 214 pages.