"Nancy Drew 02: The Hidden Staircase" by Carolyn Keene is a juvenile fiction novel published by Penguin Putnam Inc in 1930. This hardcover book, illustrated by the author herself, belongs to the Nancy Drew series and falls under the genres of mysteries, detective stories, thrillers, and suspense. With 192 pages, the book is written in English and is geared towards young readers, specifically focusing on the protagonist, Nancy Drew, and her adventures in solving mysteries.