The Strange Message in the Parchment is the fifty-fourth volume in the Nancy Drew Mystery Stories series. It was first published in 1974 under the pseudonym Carolyn Keene. The actual author was ghostwriter Harriet Stratemeyer Adams. A sheep farmer receives a mysterious telephone call shortly after he buys a series of …
The Thirteenth Pearl is the fifty-sixth volume in the Nancy Drew Mystery Stories series. It was first published in 1979 under the pseudonym Carolyn Keene. The actual author was ghostwriter Harriet Stratemeyer Adams. Although other volumes follow this one, "The Thirteenth Pearl" is the end of the original 56-book …
Treasure in the Royal Tower is a young adult novel by Carolyn Keene in the Nancy Drew stories.