The Clue of the Black Keys (Used Hardcover) - Carolyn Keene

Nancy Drew Mystery Stories #28

During an archaeological expedition in Mexico, two professors, the senior Dr. Joshua Pitt and young Terry Scott find a clue to buried treasure. The clue was a cipher carved on a stone tablet. Before the older professor had time to translate it, he and the tablet disappeared! Terry tells Nancy of his suspicions of a Mexican couple, posing as scientists, who vanished the same night as Dr. Pitt. Nancy follows a tangled trail of clues that lead to Florida and Mexico and a secret of antiquity that can only be unlocked by three black keys. 

Published 1951 Grosset & Dunlap

214 pages

5.25" X 7.75"

Condition: This book is in Very Good Condition. The pages are clean and unmarked. There is light wear on the edges and corners of the dust cover.