"It is probably the change of diet," he declared at last, after diagnosing my symptoms. "I see many such cases among foreigners who are unused to some of our rather indigestible dishes. The latter are very toothsome, and they eat heartily--with dire results," and he smiled. So well indeed did I describe my supposed ailment that before he left he wrote me out a prescription. Afterwards I made pretence of being a perfect stranger in Florence. I longed to speak of Oswald De Gex, but feared to do so because his suspicions might by that become aroused. If so, then all hope of discovering the true facts would instantly vanish. "I hope you will soon be all right and that you will enjoy your visit to our Tuscany," he said very pleasantly. "Florence is very full of visitors just now. Are you remaining long?" "I really can't tell," was my reply. "My business in London may recall me at any time." Then I thanked him for his visit, and remarked that if the mixture gave me no relief I would probably call upon him. Indeed, it was for this latter reason that I had called him in. By making his acquaintance in that manner I would, I saw, excite no suspicion, and I hoped to be able to meet the girl who was apparently under his charge. While I had been consulting him I noticed that he seemed a man of curious moods. At one moment his dark countenance was sullen and sinister, while at the next his face broadened into an expression of easy-going _bonhomie_. He spoke English extremely well, and was apparently a man of considerable taste and refinement. Truly, the situation was so puzzling that I was bewildered. After he had gone, I re-dressed myself and went across to the Gambrinus, where I had an appointment with Robertson. I found him seated alone at a table in the corner awaiting me. "Well?" he said, "I've got that address for you, Mr. Garfield--the address of Miss Thurston," and he handed me a slip of paper upon which was written: Miss Rose Thurston, Cedar Cottage, Overstrand, Norfolk. "But I thought you said she lived near Detroit?" I remarked. "She and her mother did live in America, but I have discovered that they now have a house near Cromer," was the butler's reply. So in acknowledgment of his services I passed him a couple of Italian notes, and we then had a drink together. While doing so a strange thought crossed my mind. Could it be possible that the girl I had seen with Doctor Moroni and Rose Thurston were one and the same! CHAPTER THE SEVENTH THE MILLIONAIRE'S APPREHENSIONS That same evening I made a number of inquiries concerning Doctor Moroni. On every hand I heard high praise of his skill. He was one of the principal physicians at the great hospital at Gelsomino, and among other of his illustrious patients there had been a Russian Grand Duke and an Austrian princess who lived in a magnificent villa upon the Viale dei Colli.