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That will do very well. I shall be very much surprised if it does not fetch our man.”

And it did! It is a matter of history–that secret history of a nation which is often so much more intimate and interesting than its public chronicles–that Oberstein, eager to complete the coup of his lifetime, came to the lure and was safely engulfed for fifteen years in a British prison. In his trunk were found the invaluable Bruce-Partington plans, which he had put up for auction in all the naval centres of Europe.

Colonel Walter died in prison towards the end of the second year of his sentence. As to Holmes, he returned refreshed to his monograph upon the Polyphonic Motets of Lassus, which has since been printed for private circulation, and is said by experts to be the last word upon the subject. Some weeks afterwards I learned incidentally that my friend spent a day at Windsor, whence he returned with a remarkably fine emerald tie-pin. When I asked him if he had bought it, he answered that it was a present from a certain gracious lady in whose interests he had once been fortunate enough to carry out a small commission. He said no more, but I fancy that I could guess at that lady’s august name, and I have little doubt that the emerald pin will forever recall to my friend’s memory the adventure of the Bruce-Partington plans.