The Secret of the Old Clock is the first volume in the Nancy Drew Mystery Stories series written under the pseudonym Carolyn Keene. It was first published on April 28, 1930, and rewritten in 1959 by Harriet Stratemeyer Adams. Nancy Drew is an 18-year-old high school graduate.

The Hidden Staircase is the second volume in the Nancy Drew Mystery Stories series written under the pseudonym Carolyn Keene, published in 1930 and revised in 1959. The original text was written by Mildred Wirt Benson, and she has said that it is her personal favorite of the Nancy Drew Books she wrote.

The Bungalow Mystery is the third volume in the Nancy Drew Mystery Stories series written under the pseudonym Carolyn Keene. It was the last of three books in the "breeder set" trilogy, released in 1930, to test-market the series. It was the final volume edited by Edward Stratemeyer before his death.

The Mystery At Lilac Inn is the fourth volume in the Nancy Drew Mystery Stories series. It was first published in 1931 under the pseudonym Carolyn Keene. Mildred Wirt Benson was the ghostwriter for the 1931 edition.

The Secret at Shadow Ranch is the fifth volume in the Nancy Drew Mystery Stories series. It was first published in 1931 under the pseudonym Carolyn Keene, and was ghostwritten by Mildred Wirt Benson.

The Secret of Red Gate Farm is the sixth volume in the Nancy Drew Mystery Stories series, written under the pseudonym Carolyn Keene, It was first published in 1931.

The Clue in the Diary is the seventh volume in the Nancy Drew Mystery Stories series, and was first published in 1932 under the pseudonym Carolyn Keene. Its text was revised in 1962. This is the last manuscript Mildred Wirt Benson wrote in her initial run.