"Detective Nancy Drew investigates a case involving threats to her father, stolen valuables, and a locked mansion. When the Turnbull sisters invite her to stay in their home and solve the mystery, Nancy uses her wit and bravery to uncover the truth. Follow along as she navigates through dangerous secrets and deceit to crack this thrilling case."

The Hidden Staircase

The Nancy Drew Mystery Stories was the long-running "main" Nancy Drew series, published between 1930 and 2003. Initially, titles were published by Grosset & Dunlap, but with #57 (1979) publication switched to Simon & Schuster. Some people consider these first 56 to be the original series and consider the Simon & Schuster series to be an entirely di…

The Hidden Staircase

Carolyn Keene