"Then, plainly speaking, the whole thing remains a mystery?" "Absolutely," I responded. "All my efforts have unfortunately failed." "And you entertain no suspicion of anyone?" "None whatever." "Not of that woman Yolande-or whatever her name is?" "Certainly not of her," I answered quickly. "She would assist us, if necessary." "Why are you so sure of that? She has only been in Paris a week." "Because I happen to know her."