It happened that at the moment I was clearing up the case which my friend Watson has described as that of the Abbey School, in which the Duke of Greyminster was so deeply involved. I had also a commission from the Sultan of Turkey which called for immediate action, as political consequences of the gravest kind might arise from its neglect. Therefore it was not until the beginning of the next week, as my diary records, that I was able to start forth on my mission to Bedfordshire in company with Mr. James M. Dodd. As we drove to Euston we picked up a grave and taciturn gentleman of iron-gray aspect, with whom I had made the necessary arrangements.

“This is an old friend,” said I to Dodd. “It is possible that his presence may be entirely unnecessary, and, on the other hand, it may be essential. It is not necessary at the present stage to go further into the matter.”