The Hidden Staircase

The Hidden Staircase by Carolyn Keene is 182 pages.  It is a Nancy Drew mystery book. In The Hidden Staircase, Nancy's friend, Helen, has a mystery for her to solve.  Helen's Aunt Rosemary is staying with her mother, Miss Flora.  Miss Flora's house is being haunted.  At the same time, Nancy's father gets kidnapped and a man named Nathan Gomber is trying to buy Miss Flora's house.  Meanwhile, Nancy and Helen discover hidden passages and clues.  Their discoveries lead them to suspect Nathan Gomber may be behind everything.