The Hidden Staircase by Mildred A. Wirt Benson, writing under the Carolyn Keene pseudonym, is a thrilling Nancy Drew mystery filled with secret passages, unexplained disappearances, mysterious intruders, and unexpected danger.

When Nancy Drew is asked to investigate strange happenings at an old mansion, she finds herself confronting a baffling series of incidents involving ghostly footsteps, disappearing objects, and an apparently haunted house. Meanwhile, her father becomes entangled in a troubling legal dispute that threatens to place him in serious danger.

Determined to uncover the truth, Nancy follows a trail of suspicious clues, hidden rooms, and concealed stairways that lead her deeper into a dangerous mystery. With courage, intelligence, and unwavering determination, the young detective must expose the criminals behind the frightening events before it is too late.

First published in 1930, this beloved second installment in the original Nancy Drew series helped establish one of the most enduring heroines in detective fiction.

An exciting adventure filled with suspense, ingenious discoveries, and the timeless appeal of a fearless young investigator.