Digging Up History A Museum Mystery, Book 8.

The New York Times bestselling author of Dead End Street returns with Nell Pratt discovering one of Philadelphia's darker buried secrets . . . When a summer intern at the Preservation Society discovers an aged document hidden in the binding of an antique book, Society president Nell Pratt is intrigued by the possibilities: is it a valuable historic document or just a useless scrap of paper? When analysis reveals that it's a hand-drawn map...