by Carolyn Keene
A group of professional detectives challenge Nancy to tackle a mystery that they have failed to solve: find an invaluable message hidden by a missionary centuries ago in a hollow oak tree in Illinois. While searching the woods for the ancient tree, Nancy and her friends live with a group of young archaeologists who are excavating prehistoric Indian burial mounds on a nearby farm. A shadowy enemy stalks Nancy and harasses everyone at the dig. The young investigator pursues her dangerous adversary to an outlaws’ cave, and is threatened when she discovers an unusual treasure. How Nancy, with few clues to go on, solves this complex mystery will thrill all readers.
Used Hardbound yellow matte cover with black & white multi-picture endpapers – copyright in book 1972, probably 1974 printing per last title on back cover (“Strange Message in the Parchment”)
Near Fine condition – corner wear on one corner, minimal shelf wear, slight staining on covers
