He spoke with a well-modulated voice, and a fluency that told of the intelligence of the man. His eyes fixed me, but not in an embarrassing manner; it was the habit of observation that prompted their concentration--that was obvious. His forehead was high and slightly furrowed with two vertical wrinkles between the eyebrows. His face was mobile and expressive at times, then suddenly calm. In my very brief observation I knew that he was able to govern its expression well. In the days that were coming, I learned that in the presence of danger or possible trickery that face became stony and immovable, a mask that talked and commanded, while hiding the suppressed energy of the man. The bell rang before Oakes could proceed with his statement, and Dr. Moore was shown in. His coming enlivened us both, and after a few words of greeting I found the opportunity, and said: "Mr. Oakes, it is not exactly clear to me why Mandel & Sturgeon recommended me as their representative. They have so many men in their office whom they might use in that capacity." "Doubtless you will hear from them yourself before we go, Mr. Stone. Meantime, I may explain. You were in their employ at one time, I believe?" "Yes, a great many years ago." "They think that some legal matters might arise, where a man on the spot would be of value, and it seems best that their representative with me should be one not easily identified as working with them. You know, Mr. Stone, we are not advertising our mission." "I have been in Mona as Mr. Clark, their agent, looking after the Mansion and other property, and if I return there, it must be under some business pretext, or people will suspect me. You, being an independent party, not known as connected with the firm in any way, can accompany me in the rôle of a friend on an outing, or as a possible purchaser. You see, we are trying to solve a mystery, so the less attention we attract the better." "I see. So you have been there already, Mr. Oakes?" "Yes, gentlemen. I will tell you about this affair very briefly now. You will learn more later, if you enter upon its solution with me. "The Mansion was originally the property of George Mark, who died some years ago, leaving it to his two sons, Winthrop and Odell. Both were single men at that time, but Odell married a couple of years ago and persuaded his brother to sell his share of the property to him. Winthrop, who was the older, did not care to part with it, but finally disposed of his interest to his brother, who immediately moved into the place with his bride. The old servants were still in charge, and everything had been kept up to a high standard of excellence, although no one had lived there since the old man died. "Odell had travelled some, and lived mostly in the city, while Winthrop had been engrossed in amassing a large fortune in speculation. He had resided in Mona, keeping his own place, saying he did not care for the Mansion as a home after his father died."