CHAPTER I THE MYSTERIOUS BLUE-EYED BOY CHAPTER II NEIGHBORS IN THE CAVE CHAPTER III AN UNWELCOME VISITOR CHAPTER IV THE CAVE FAMILY DISAPPEARS CHAPTER VII THE CHARCOAL MAKER CHAPTER IX "I'M GOING TO SOLVE THE MYSTERY" CHAPTER X A SOILED YELLOWED ENVELOPE CHAPTER XIII JOSE'S STRANGE STORY CHAPTER XVI ON A DANGEROUS TRAIL THE MYSTERY OF |