A bit about the series

The series was ghostwritten in the early years primarily by Mildred Wirt Benson. Harriet Stratemeyer Adams, who succeeded her father Edward as the head of the Syndicate, contributed a number of volumes and oversaw the substantial revisions begun in the fifties.
Over 200 million books have been sold worldwide. Many people collect the series, which has gone through several formats over the years. The books have been in print continuously since 1930, however, many titles were revised or changed completely in the 1950s and 1960s. All titles currently in print are known as "revised text". Starting in the early 1980s, the original series was extended with new volumes published in paperback, and in the late 1980s a new series was created for Simon & Schuster under the epithet The Nancy Drew Files, starting with Secrets Can Kill. In recent years, the spinoff series Nancy Drew on Notebooks , Nancy Drew: On Campus have been published. The Nancy Drew Girl Detective series is the newest version of tales about the titian-haired sleuth.
Nancy Drew also appeared with The Hardy Boys in the 36 volume Supermystery series, plus a Be Your Own Detective series