THE CLUE OF THE BLACK KEY
![THE CLUE OF THE BLACK KEY](data/ebooks/pics/ndms28.jpg)
![THE CLUE OF THE BLACK KEY](data/ebooks/pics/ndms28_1.jpg)
Terry Scott, a young archeology 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 found a clue to the buried treasure on a cipher. Soon after, Dr. Pitt and the cipher disappeared. Terry suspects the Tinos, a couple posing as scientists who vanished at the same time.