The Hidden Staircase - The Nancy Drew Files

Nancy is introduced to the Turner sisters, Pat and Rosemary by Abigail Rem, a character who aids Nancy in the previous, and first volume of the series. They believe that their home is haunted. Nancy's father is being harassed by a crooked character, Nathan Gombet, who threatens violence. Carson Drew, undaunted, agrees to allow Nancy to investigate the house and sends his revolver with her. He will travel to Chicago during the first part of Nancy's stay at the old estate and join her later.