"The Thirteenth Pearl" is a vintage Nancy Drew Mystery novel written by Carolyn Keene in 1979. This hardcover book is part of the Nancy Drew Mystery Stories series and features detective stories aimed at young adults, ages 9-12, and adults. The novel is illustrated making it a collectible piece for fans of mystery and juvenile fiction genres. The story follows Nancy Drew as she solves a mysterious case involving a thirteenth pearl, making it an engaging and entertaining read for fans of the series.