The Hidden Staircase, Nancy Drew Mystery Stories, number 2 in the series. Author: Carolyn Keene. Hardcover, 182 pages. Publisher: Grosset & Dunlap, copyright 1959 and printed in the USA in 1964. 

Condition: The book is in overall good minus condition. Two pages at the front (end paper, title page) have come loose from the binding (see photo below). The inside pages are otherwise in excellent condition. The covers are in very good condition with some light wear on the edges (see photos).

Synopsis: Revised and published May 15, 1959 • Revised by Harriet Stratemeyer Adams

Nancy Drew’s latest case begins when her friend Helen Corning asks for help investigating strange occurrences at Twin Elms, an old mansion where Helen’s great-grandmother, Mrs. Flora Turnbull, and great-aunt, Mrs. Rosemary Hayes, are being frightened by mysterious noises, ghostly figures, and unexplained disturbances. The elderly women fear they may be forced to abandon their beloved home, while a suspicious real estate deal involving Nancy’s father, Carson Drew, raises further questions. Nancy soon suspects that the haunting is not the work of spirits, but part of a carefully planned scheme.

As Nancy and Helen search the mansion for answers, they uncover secret passages, hidden staircases, and clues pointing to a dangerous conspiracy. When Carson Drew becomes entangled in the mystery and disappears, Nancy must use all her detective skills to connect the seemingly unrelated events. Her investigation takes her into perilous situations as she works to discover who is behind the haunting, why the mansion is being targeted, and where her missing father is being held. The secrets of Twin Elms will finally be revealed in a thrilling conclusion to this classic Nancy Drew adventure.