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The doctor tapped the advertisement with his forefinger impressively。
〃Fifty pounds！〃 he repeated。 〃There isn't a person in the world to whom the knowledge of my movements is worth fifty poundsexcept〃
〃Except？〃 the Prince murmured。
〃Except Mr。 Inspector Jacks；〃 Dr。 Whiles said slowly。
The Prince seemed scarcely to grasp the situation。
〃Well；〃 he said； 〃fifty pounds is not a great deal of money。 Some unknown personpossibly； as you suggest； Mr。 Jacksis willing to give fifty pounds to discover your whereabouts。 I； on the other hand； am giving a thousand guineas to keep you here as my guest。 The odds do not seem even； do they？〃
〃Put in that way；〃 Dr。 Whiles admitted； 〃they certainly do not。 But there is another thing which has come into my mind。〃
The Prince smiled and helped himself to one of the very excellent cigarettes which had been provided for the delectation of his visitor。
〃Pray treat me with every confidence； Dr。 Whiles；〃 he said。 〃Tell me exactly what is in your thoughts。〃
〃Well； then； I will；〃 the doctor answered。 〃Sitting here with nothing particular to do； one has plenty of leisure to think。 For the first time； I have seriously tried to puzzle out what Mr。 Inspector Jacks really wanted with me； why he came down to ask me about the person whom I treated for injuries resulting from a bicycle accident one Wednesday evening not long ago； why he took me up to London to see if I could identify that person in a very different guise。 I have tried to put the pieces together and to ask myself what he meant by it all。〃
〃With so much time upon your hands； Dr。 Whiles；〃 the Prince remarked； 〃you can scarcely fail to have arrived at some reasonable explanation。〃
〃I don't know whether it is reasonable or not；〃 the doctor answered； 〃but the obvious explanation is getting on my nerves。 There are two things which I cannot get away from。 One is that I cannot for the life of me imagine your riding a bicycle twelve or fifteen miles north of London between eleven o'clock and midnight； and the other〃
〃Come； the other？〃 the Prince remarked encouragingly。
〃The other；〃 the doctor continued； 〃is the fact that within half a mile of my house runs the main London and North Western line。〃
〃The London and North Western Railway line；〃 the Prince repeated； 〃and what has that to do with it？〃
〃This much；〃 the doctor answered； 〃that on that very night； about half an hour before yourshall we call it bicycle accident？the special train from Liverpool to London passed along that line。 You will remember the tragic occurrence which took place before she reached London； the murder of the man Hamilton Fynes。 If you read the report of the evidence at the inquest； you will notice the engine driver's declaration that the only time on the whole journey when he travelled at less than forty miles an hour was when passing over the viaduct and before entering the tunnel which is plainly visible from my house。〃
〃This is very interesting；〃 the Prince remarked； 〃but it is not new。 We have known all this before。 Perhaps； though； some fresh thing has come into your mind connected with these happenings。 If so； please do not hesitate。 Let me hear it。〃
〃It is a fresh thing to me；〃 the doctor said；〃fresh； in a sense； though all the time I have had an uneasy feeling at the back of my head。 I know now what it was which brought Inspector Jacks to see me。 I know now what it was he had at the back of his head concerning the man who met with a bicycle accident at this psychological moment。〃
〃Inspector Jacks is a very shrewd fellow；〃 the Prince said。 〃I should not be in the least surprised if you were entirely right。〃
The doctor moved restlessly in his chair。 His eyes remained on his companion's face； as though fascinated。
〃Can't you understand；〃 he said； 〃that Inspector Jacks is on your track？ Rightly or wrongly； he believes that you had something to do with the murder on the train that night。〃
The Prince nodded amiably。 He seemed in no way discomposed。
〃I feel convinced；〃 he said； 〃that you are right。 I agree with you。 I believe that Inspector Jacks has had that idea for some little time now。〃
The doctor gripped the sides of his chair and stared at this man who discussed a matter so terrible with calm and perfect ease。
〃Yes； I have felt that more than once；〃 the Prince continued。 〃My presence upon the spot at that precise moment with injuries which had to be explained somehow or other； was； without doubt； unfortunate。〃
The two men sat for several moments without further speech。 The doctor's features seemed to reflect something of the horror which he undoubtedly felt。 The Prince appeared only a trifle bored。
〃So that is why；〃 the former exclaimed hoarsely； 〃I have been appointed your physician in chief！〃
〃I had given you the credit； my dear doctor；〃 the Prince said smoothly； 〃of having arrived at that decision some time ago。 To a man of your perceptions there can scarcely have been any question about it at all。 Besides； even Princes； you know； do not give fees of a thousand guineas for nothing。〃
Dr。 Whiles rose slowly to his feet。
〃You know the secret of that murder！〃 he declared。
〃Why ask me？〃 the Prince answered。 〃If I tell you that I do； you may find conscientious scruples about remaining here。 A man is not bound； you know； to give himself away。 Make the best of things； and do not try to see too far。〃
The doctor was looking a little shaken。
〃If you were mixed up in that affair；〃 he said； 〃and if I remain here when my evidence is needed； I become an accomplice。〃
〃Only if you remain here voluntarily；〃 the Prince reminded him cheerfully。 〃Remember that and be comforted。 No effort that you could make now would bring you into touch with Mr。 Inspector Jacks until I am quite prepared。 So you see； my dear doctor； that you have nothing with which to reproach yourself。 I will not insult you；〃 he continued； 〃by suggesting that a reward of fifty pounds could possibly have influenced your attitude。 If you have suffered your mind to dwell upon it for a single moment； try and remember the relative unimportance of such an amount when compared with a thousand guineas。〃
The doctor moved to the window and back again。
〃Supposing；〃 he said； 〃I decline to remain here？ Supposing I say that； believing you now to have a guilty knowledge of this murder； I repudiate our bargain？ Supposing I say that I will have nothing more to do with your thousand guineas；that I will leave this house？〃
〃Then we come to close quarters；〃 the Prince answered； 〃and you force me to tell you in plain words that； until I am ready for you to leave it； you are as much a prisoner in this room as though the keys of the strongest fortress in Europe were turned upon you。 I have told you this before。 I thought that we perfectly understood one another。〃
〃I did not understand；〃 the doctor protested。 〃I knew that there was trouble； but I did not know that it was this！〃
〃The fact of your knowing or not knowing makes no difference；〃 the Prince answered。 〃You are no longer a free agent。 The only question for you to decide is whether you remain here willingly or whether you will force me to remind you of our bargain。〃
The doctor was sitting down again now。 All the time he watched the Prince with a gleam in his eyes； partly of horror； partly of fear。 He no longer doubted but that he was in the presence of a criminal。
〃I am sorry；〃 the Prince continued； 〃that you have allowed this little matter to disturb you。 I thought that we had arranged it all at our last interview。 If you did not surmise my reasons for keeping you here； then I am afraid I gave you credit for more intelligence than you possess。 You will excuse me now； I am sure；〃 he added； rising。 〃I have some letters to send off before I change。 By the bye； do you care to give me your parole？ It might； perhaps； lessen the inconvenience to which you are unfortunately subject。〃
The doctor shook his head。
〃No；〃 he said； 〃I will not give my parole！〃
Late that night； he tried the handle of his door and found it open。 The corridor outside was in thick darkness。 He felt his way along by the wall。 Suddenly； from behind； a pair of large soft hands gripped him by the throat。 Slowly he was drawn backalmost strangled。
〃Let me go！〃 he called out； struggling in vain to find a body upon which he could gain a grip。
The grasp only tightened。
〃Back to your rooms！〃 came a whisper through the darkness。
The doctor returned。 When he staggered into his sitting room； he turned up the electric light。 There were red marks upon his throat and perspiration upon his forehead。 He opened the door once more and looked out upon the landing； striking a match and holding it over his head。 There was no one in sight； yet all the time he had the uncomfortable feeling that he was being watched。 For the first time in his life he wondered whether a thousand guineas was； after all； such a magnificent fee！
Almost at the same time the Prince sat back in the shadows of the Duchess of Devenham's box at the Opera and talked quietly to Lady Grace。
〃But tell me； Prince；〃 she begged； 〃I know that you are glad to go home； but won't you really miss this a little；the music； the life； all these things that make u