The product is a 1st edition, 1st print hardcover copy of Nancy Drew #43 "The Mystery of the 99 Steps" from 1966 by Carolyn Keene. Published by Grosset & Dunlap in the United States, this illustrated book falls under the Mystery genre within Literature & Fiction. It is a valuable collectible for fans of the Nancy Drew character family, especially for those interested in antiquarian and collectible books. This original edition is a sought-after item for collectors looking to add a piece of literary history to their collection.