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Rh centre wood, and that shred was strongly impregnated with moth balls. At some time or another the films had been carried in the overcoat pocket of the man who was killed in the Tube. Was it he who had dropped them here? Hardly. His movements were all accounted for.

No, it was the other man, the "doctor." He had taken the films when he had taken the paper. It was he who had dropped them here during his struggle with the woman.

I had got my clue! I would have the roll developed, and then I would have further developments to work upon.

Very elated, I left the house, returned the keys to Mrs. James and made my way as quickly as possible to the station. On the way back to town, I took out my paper and studied it afresh. Suddenly the figures took on a new significance. Suppose they were a date? 17 1 22. The 17th of January, 1922. Surely that must be it! Idiot that I was not to have thought of it before. But in that case I must find out the whereabouts of Kilmorden Castle, for to-day was actually the 14th. Three days. Little enough—almost hopeless when one had no idea of where to look!

It was too late to hand in my roll to-day. I had to hurry home to Kensington so as not to be late for dinner. It occurred to me that there was an easy way of verifying whether some of my conclusions were correct. I asked Mr. Flemming whether there had been a camera amongst the dead man's belongings. I knew that he had taken an interest in the case and was conversant with all the details.

To my surprise and annoyance he replied that there had been no camera. All Carton's effects had been gone over very carefully in the hopes of finding something that might throw light upon his state of mind. He was