The Clue of the Black Keys
The Clue of the Black Keys
Book 28 of Nancy Drew Mystery Stories
Description:
Terry Scott, a young archaeology professor, seeks Nancy's help in unearthing a secret of antiquity which can be unlocked by three black keys. While on an archaeological expedition in Mexico, terry and Dr. Joshua Pitt came across a clue to the buried treasure. The clue was a cipher carved on a stone tablet.