"I believe he is staying at the hotel alone. He has been here for a fortnight or more, and I have never seen him speak to anybody, though I have exchanged nods with him every morning. His principal recreation seems to lie in taking long solitary walks along the coast. He has been in the habit of going out every day, and not returning until dinner is half over. Perhaps the hotel proprietor knows who his friends are." "Would you be so kind as to step downstairs and inquire? I do not wish to leave him, but his friends should be telegraphed to at once and asked to come and take charge of him." "Certainly. And I'll send the telegram while I am down there." But Colwyn returned in a few moments to say that the hotel proprietor knew nothing of his guest. He had never stayed in the house before, and he had booked his room by a trunk call from London. On arrival he had filled in the registration paper in the name of James Ronald, but had left blank the spaces for his private and business addresses. He looked such a gentleman that the proprietor had not ventured to draw his attention to the omissions. "Another instance of how hotels neglect to comply with the requirements of the Defence of the Realm Act!" exclaimed Sir Henry. "Really, it is very awkward. I hardly know, in the circumstances, how to act. Speaking as a medical man, I say that he should not be left alone, but if he orders us out of his room when he recovers his senses what are we to do? Can you suggest anything?" He shot a keen glance at his companion. "I should be in a better position to answer you if I knew what you consider him to be really suffering from. I was under the impression it was a bad case of shell-shock, but your remarks suggest that it is something worse. May I ask, as you are a medical man, what you consider the nature of his illness?" Sir Henry bestowed another searching glance on the speaker. He noted, for the first time, the keen alertness and intellectuality of the other's face. It was a fine strong face, with a pair of luminous grey eyes, a likeable long nose, and clean-shaven, humorous mouth--a man to trust and depend upon. "I hardly know what to do," said Sir Henry, after a lengthy pause, which he had evidently devoted to considering the wisdom of acceding to his companion's request. "This gentleman has not consulted me professionally, and I hardly feel justified in confiding my hurried and imperfect diagnosis of his case, without his knowledge, to a perfect stranger. On the other hand, there are reasons why somebody should know, if we are to help him in his weak state. Perhaps, sir, if you told me your name----" "Certainly: my name is Colwyn--Grant Colwyn." "You are the famous American detective of that name?" "You are good enough to say so."