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 clothes I had left behind me, flung into a heap in a corner of the room.

"While I was looking at them in a state of mind almost impossible to describe, my landlady tapped at the door and brought me a note.

Under the circumstances, madam,' she said, 'you may like to see this letter. I have just found it, stamped and directed as you see, on the davenport in the drawingroom. I think it is in Mr. Mainwaring's writing.'

"I took it from her and looked at it eagerly. It was addressed in my husband's writing to a Don of the college (Trinity) where he had taken his degree. I did not hesitate to open it. Here it is, Dr. Halifax; you may like to read it. It may possibly help you to throw some light on this awful mystery."

Mrs. Mainwaring gave me the note as she spoke. It contained the following words:—

",—I much regret having missed you when I called yesterday after noon to say good-bye. I must take the present opportunity of thanking you for your kindness to me during the whole of my University career. I leave Cambridge by an early train this morning, or would call again to say farewell in person. I hope to call to see you on the first occasion when I revisit Cambridge.

"Yours sincerely, "."

I read the letter twice, and then returned it without comment to the wife.

"Will you redirect it and post it?" I said, after a pause.

She answered me almost in a whisper.

"The strange thing about that letter is this," she said. "It is addressed to a dead person. Mr. Grainger, Edward's old tutor, has been dead for many years. My husband felt his death keenly when it occurred. He has many times told me of the personal interest Mr. Grainger took in him. Have you no comment to make with regard to this letter, Dr. Halifax?"

"I shall have plenty to say in a moment," I answered. "That letter will give us a very important clue to our future actions, but now to proceed: Have you nothing further to tell me?"

"Yes; after reading the letter, I rushed to the nearest telegraph office and sent a telegram with a prepaid reply to my home. I waited with what patience I could for the answer, which came within an hour and a half. My husband had not returned to Stanley Villa. I then took the next train to town, and went back to Croydon on the chance of his having arrived there during the day. He had not done so. Dr. Abbott happens to be away, so I have come to you. Can you give me advice? Will you help me in any way?"

"Yes, of course, I will help you," I said. "Pray sit down." She had been standing with her hands clasped tightly together during the greater part of our interview. "Your story is a very strange one," I continued, "and I will give it and you my best attention in a moment. I must run away first, however, to give some instructions with regard to one of my patients, then I shall be at your service."