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. Author: Carolyn Keene Reading Level: Ages 8 to 14 years Format: Hardcover, 192 pages Publisher: Penguin Group USA ISBN: 9780448095288
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