Contents [CHAPTER I THE MILLIONAIRE’S DAUGHTER] [CHAPTER II THE COMING OF THE CHAROLAIS] [CHAPTER III LUPIN’S WAY] [CHAPTER IV THE DUKE INTERVENES] [CHAPTER V A LETTER FROM LUPIN] [CHAPTER VI AGAIN THE CHAROLAIS] [CHAPTER VII THE THEFT OF THE MOTOR-CARS] [CHAPTER VIII THE DUKE ARRIVES] [CHAPTER IX M. FORMERY OPENS THE INQUIRY] [CHAPTER X GUERCHARD ASSISTS] [CHAPTER XI THE FAMILY ARRIVES] [CHAPTER XII THE THEFT OF THE PENDANT] [CHAPTER XIII LUPIN WIRES] [CHAPTER XIV GUERCHARD PICKS UP THE TRUE SCENT] [CHAPTER XV THE EXAMINATION OF SONIA] [CHAPTER XVI VICTOIRE’S SLIP] [CHAPTER XVII SONIA’S ESCAPE] [CHAPTER XVIII THE DUKE STAYS] [CHAPTER XIX THE DUKE GOES] [CHAPTER XX LUPIN COMES HOME] [CHAPTER XXI THE CUTTING OF THE TELEPHONE WIRES] [CHAPTER XXII THE BARGAIN] [CHAPTER XXIII THE END OF THE DUEL]