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Nancy Drew 28: The Clue of the Black Keys GB (Nancy Drew)
Nancy Drew 28 The Clue of the Black Keys GB - Nancy Drew Author:Carolyn Keene 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.