... XV - A New Suspect CHAPTER XVI - Sold! CHAPTER XVII - Through the Trap Door CHAPTER XVIII - A Confession CHAPTER XIX - The Hidden Staircase CHAPTER XX - Nancy’s Victory Both girls froze in their... VIII - A Startling Plunge CHAPTER IX - A Worrisome Delay CHAPTER X - The Midnight Watch CHAPTER XI - An Elusive Ghost CHAPTER XII - The Newspaper Clue CHAPTER XIII - The Crash CHAPTER XIV - An... I - The Haunted House CHAPTER II - The Mysterious Mishap CHAPTER III - A Stolen Necklace CHAPTER IV - Strange Music CHAPTER V - A Puzzling Interview CHAPTER VI - The Gorilla Face CHAPTER VII -