The Hidden Staircase

Nancy Drew's reputation as an amateur detective precedes her when two elderly sisters ask her to look into a haunting at their mansion. Can Nancy help them find the source of the strange happenings before the sisters are forced to sell the house? The Hidden Staircase is the second of the Nancy Drew Mystery Stories . Carolyn Keene was a pseudonym used by the series' authors; this particular book was written by Mildred Wirt Benson, who claimed it was her favorite Nancy Drew story that she wrote. It was first published in 1930, and later revised in 1959.