left on her mind was that he was clean shaven, of medium height, and looked exactly like a butcherâs man. At this description Poirot shrugged his shoulders philosophically.
âIt is as I tell you, Hastings,â he said to me, after the trial. âHe is an artist, this one. He disguises himself not with the false beard and the blue spectacles. He alters his features, yes; but that is the least part. For the time being he is the man he would be. He lives in his part.â
Certainly I was compelled to admit that the man who had visited us from Hanwell had fitted in exactly with my idea of what an asylum attendant should look like. I should never for a moment have dreamt of doubting that he was genuine.
It was all a little discouraging, and our experience on Dartmoor did not seem to have helped us at all. I said as much to Poirot, but he would not admit that we had gained nothing.
âWe progress,â he said; âwe progress. At every contact with this man we learn a little of his mind and his methods. Of us and our plans he knows nothing.â
âAnd there, Poirot,â I protested, âhe and I seem to be in the same boat. You donât seem to me to have any plans, you seem to sit and wait for him to do something.â
Poirot smiled.
â Mon ami, you do not change. Always the same Hastings, who would be up and at their throats. Perhaps,â he added, as a knock sounded on the door, âyou have here your chance; it may be our friend who enters.â And he laughed at my disappointment when Inspector Japp and another man entered the room.
âGood evening, moosior,â said the Inspector. âAllow me to introduce Captain Kent of the United States Secret Service.â
Captain Kent was a tall, lean American, with a singularly impassive face which looked as though it had been carved out of wood.
âPleased to meet you, gentlemen,â he murmured, as he shook hands jerkily.
Poirot threw an extra log on the fire, and brought forward more easy chairs. I brought out glasses and the whisky and soda. The captain took a deep draught, and expressed appreciation.
âLegislation in your country is still sound,â he observed.
âAnd now to business,â said Japp. âMoosior Poirot here made a certain request to me. He was interested in some concern that went by the name of the Big Four, and he asked me to let him know at any time if I came across a mention of it in my official line of business. I didnât take much stock in the matter, but I remembered what he said, and when the captain here came over with rather a curious story, I said at once, âWeâll go round to Moosior Poirotâs.ââ
Poirot looked across at Captain Kent, and the American took up the tale.
âYou may remember reading, M. Poirot, that a number of torpedo boats and destroyers were sunk by being dashed upon the rocks off the American coast. It was just after the Japanese earthquake, and the explanation given was that the disaster was the result of a tidal wave. Now, a short time ago, a roundup was made of certain crooks and gunmen, and with them were captured some papers which put an entirely new face upon the matter. They appeared to refer to some organization called the âBig Four,â and gave an incomplete description of some powerful wireless installationâa concentration of wireless energy far beyond anything so far attempted, and capable of focusing a beam of great intensity upon some given spot. The claims made for this invention seemed manifestly absurd, but I turned them in to headquarters for what they were worth, and one of our highbrow professors got busy on them. Now it appears thatone of your British scientists read a paper upon the subject before the British Association. His colleagues didnât think great shakes of it, by all accounts, thought it far-fetched and fanciful, but your scientist stuck to his guns, and declared that he himself