The Clue of the Black Keys

Terry Scott, a young archaeology professor, seeks Nancy's help in unearthing a secret of antiquity which can only 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. Before the professors had time to translate the cipher, the tablet disappeared -- and with it Dr. Pitt! Terry tells Nancy of his suspicions of the Tinos, a Mexican couple posing as scientists, who vanished the same night as Dr. Pitt.

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The young detective is plunged into an adventure that demands all her ingenuity and bravery as she and her friends follow a tangled trail of clues that lead to the Florida Keys and finally to Mexico. Again, Carolyn Keene has woven a suspense-filled story that will thrill her millions of readers.