Part of the Mavenhill Classics series, this annotated edition of The Hidden Staircase presents the second Nancy Drew mystery as it was originally published in 1930, accompanied by a contemporary foreword and structured summary notes. When unexplained disturbances begin to plague a secluded household, fear and speculation quickly take hold. Doors open without cause. Footsteps echo where no one should be. A sense of intrusion lingers without explanation.