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. Recommended for ages 8 to 12.
Format: Hardcover Number of Pages: 181 Vendor: Grosset & Dunlap Publication Date: 1935 Dimensions: 7.71 X 5.01 X 0.72 (inches)