The Hidden Window Mystery is the thirty-fourth volume in the Nancy Drew Mystery Stories series. It was first published in 1956 under the pseudonym Carolyn Keene. The actual author was ghostwriter Harriet Stratemeyer Adams.
Nancy and her friends, Bess and George travel to Charlottesville, Virginia in search for a missing stain-glass window. The girls stay with Nancy's cousin Susan. Nancy discovers someone is trying to keep her away from Charlottesville. The mansion they are staying at is said to be haunted by mysterious ghost. Also Nancy's new neighbours brother, Alonzo rugby is in Charlottesville and is a major suspect in this mystery.