Carolyn Keene

The Ghost of Blackwood Hall is the twenty-fifth volume in the Nancy Drew Mystery Stories series. It was first published in 1948 under the pseudonym Carolyn Keene. The actual author was ghostwriter Mildred Wirt Benson.

Captive Witness is the 64th volume in the Nancy Drew Stories series. Nancy travels to Austria to solve a mystery. It is about stolen film and 10 refugee children trapped in Hungary. It was originally titled "Captive Witness Mystery."

The Clue of the Broken Locket is the eleventh volume in the Nancy Drew Mystery Stories series. It was first published in 1934, and was written by Mildred Benson under the pseudonym Carolyn Keene.