Nancy Drew: The Hidden Staircase, published in 1992 by Applewood Books. This is a reprint of the 1930 original book. This book is in good condition. The cover does have some yellowing due to age. Included is an introduction by Nancy Pickard, who wrote "I owe it All to Nancy Drew" along with many other mysteries.
Applewood books are reprints based on the original with illustrations by artist Russell Tandy. The book and its dust jacket are in fine condition, it does have a few smudge marks on the spine but otherwise in like new condition. It looks like it has never been read.
7-1/2"L x 5-1/4"W