"At this I lost my temper, Mr. Holmes, and I spoke with some warmth.
"'I have seen your son, and I am convinced that for some reason of your own you are concealing him from the world. I have no idea what your motives are in cutting him off in this fashion, but I am sure that he is no longer a free agent. I warn you, Colonel Emsworth, that until I am assured as to the safety and well-being of my friend I shall never desist in my efforts to get to the bottom of the mystery, and I shall certainly not allow myself to be intimidated by anything which you may say or do.'
"The old fellow looked diabolical, and I really thought he was about to attack me. I have said that he was a gaunt, fierce old giant, and though I am no weakling I might have been hard put to it to hold my own against him. However, after a long glare of rage he turned upon his heel and walked out of the room. For my part, I took the appointed train in the morning, with the full intention of coming straight to you and asking for your advice and assistance at the appointment for which I had already written."
Such was the problem which my visitor laid before me. It presented, as the astute reader will have already perceived, few difficulties in its solution, for a very limited choice of alternatives must get to the root of the matter. Still, elementary as it was, there were points of interest and novelty about it which may excuse my placing it upon record. I now proceeded, using my familiar method of logical analysis, to narrow down the possible solutions.