Author: Wilhelmina Rankin
Bio: Wilhelmina Rankin was a Carolyn Keene ghostwriter and co-wrote *The Clue of the Black Keys*, the twenty-eighth volume in the Nancy Drew mystery series. It was first published in 1951 under the pseudonym Carolyn Keene, and the actual authors were ghostwriters Wilhelmina Rankin and Harriet Stratemeyer Adams.