We were ushered into a little sitting-room arranged with formal precision, and there, after a lapse of a minute or so, my friend of yesterday came to us.

'Monsieur le docteur,' he said, smiling. 'Mademoiselle.' He bowed to Flora.

'Perhaps,' I began, 'you have heard of the tragedy which occurred last night.' His face grew grave.

'But certainly I have heard. It is horrible. I offer mademoiselle all my sympathy. In what way can I serve you?' 'Miss Ackroyd,' I said, 'wants you to - to ' 'To find the murderer,' said Flora in a clear voice.

'I see,' said the little man. 'But the police will do that, will they not?' 'They might make a mistake,' said Flora. 'They are on their way to make a mistake now, I think. Please, M. Poirot, won't you help us? If- if it is a question of money -' Poirot held up his hand.

'Not that, I beg of you, mademoiselle. Not that I do not care for money.' His eyes showed a momentary twinkle.

'Money, it means much to me and always has done. No, if I go into this, you must understand one thing clearly. I shall go through with it to the end. The good dog, he does not leave the scent, remember! You may wish that, after all, you had left it to the local police.' 'I want the truth,' said Flora, looking him straight in the eyes.

'All the truth?' 'All the truth.' 'Then I accept,' said the little man quietly. 'And I hope you will not regret those words. Now, tell me all the circumstances.'

'Dr Sheppard had better tell you,' said Flora. 'He knows more than I do.' Thus enjoined, I plunged into a careful narrative, embodying all the facts I have previously set down. Poirot listened carefully, inserting a question here and there, but for the most part sitting in silence, his eyes on the ceiling.

I brought my story to a close with the departure of the inspector and myself from Fernly Park the previous night.

'And now,' said Flora, as I finished, 'tell him all about Ralph.' I hesitated, but her imperious glance drove me on.

'You went to this inn - this Three Boars - last night on your way home?' asked Poirot, as I brought my tale to a close. 'Now exactly why was that?' I paused a moment to choose my words carefully.

'I thought someone ought to inform the young man of his uncle's death. It occurred to me after I had left Fernly that possibly no one but myself and Mr Ackroyd were aware that he was staying in the village.' Poirot nodded.

'Quite so. That was your only motive in going there, eh?' 'That was my only motive,' I said stiffly.

'It was not to - shall we say - reassure yourself about ce jeune homme.' 'Reassure myself?' 'I think, M. le docteur, that you know very well what I mean, though you pretend not to do so. I suggest that it would have been a relief to you if you had found that Captain Paton had been at home all the evening.' 'Not at all,' I said sharply.

The little detective shook his head at me gravely.

'You have not the trust in me of Miss Flora,' he said. 'But no matter. What we have to look at is this - Captain Paton is missing, under circumstances which call for an explanation.

I will not hide from you that the matter looks grave. Still, it may admit of a perfectly simple explanation.' 'That's just what I keep saying,' cried Flora eagerly.

Poirot touched no more upon that theme. Instead he suggested an immediate visit to the local police. He thought it better for Flora to return home, and for me to be the one to accompany him there and introduce him to the officer in charge of the case.

We carried out this plan forthwith. We found Inspector Davis outside the police station looking very glum indeed.

With him was Colonel Melrose, the Chief Constable, and another man whom, from Flora's description of 'weaselly,' I had no difficulty in recognizing as Inspector Raglan from Cranchester.

I know Melrose fairly well, and I introduced Poirot to him and explained the situation. The chief constable was clearly vexed, and Inspector Raglan looked as black as thunder. Davis, however, seemed slightly exhilarated by the sight of his superior officer's annoyance.

'The case is going to be plain as a pikestaff,' said Raglan.

'Not the least need for amateurs to come butting in. You'd think any fool would have seen the way things were last night, and then we shouldn't have lost twelve hours.' He directed a vengeful glance at poor Davis, who received it with perfect stolidity.

'Mr Ackroyd's family must, of course, do what they see fit,' said Colonel Melrose. 'But we cannot have the official investigation hampered in any way. I know M. Poirot's great reputation, of course,' he added courteously.

'The police can't advertise themselves, worse luck,' said Raglan.

It was Poirot who saved the situation.

'It is true that I have retired from the world,' he said. 'I never intended to take up a case again. Above all things, I have a horror of publicity. I must beg, that in the case of my being able to contribute something to the solution of the mystery, my name may not be mentioned.' Inspector Raglan's face lightened a little.

'I've heard of some very remarkable successes of yours,' observed the colonel, thawing.

'I have had much experience,' said Poirot quietly. 'But most of my successes have been obtained by the aid of the police. I admire enormously your English police. If Inspector Raglan permits me to assist him, I shall be both honoured and flattered.' The inspector's countenance became still more gracious.

Colonel Melrose drew me aside.

'From all I hear, this little fellow's done some really remarkable things,' he murmured. 'We're naturally anxious not to have to call in Scotland Yard. Raglan seems very sure of himself, but I'm not quite certain that I agree with him.

You see, I - er - know the parties concerned better than he does. This fellow doesn't seem out after kudos, does he?

Would work in with us unobtrusively, eh?' 'To the greater glory of Inspector Raglan,' I said solemnly.

'Well, well,' said Colonel Melrose breezily in a louder voice, 'we must put you wise to the latest developments, M. Poirot.' 'I thank you,' said Poirot. 'My friend. Doctor Sheppard, said something of the butler being suspected?' 'That's all bunkum,' said Raglan instantly. 'These high-class servants get in such a funk that they act suspiciously for nothing at all.' 'The fingerprints?' I hinted.

'Nothing like Parker's.' He gave a faint smile, and added: 'And yours and Mr Raymond's don't fit either, doctor.' 'What about those of Captain Ralph Paton?' asked Poirot quietly.

I felt a secret admiration of the way he took the bull by the horns. I saw a look of respect creep into the inspector's eye.

'I see you don't let the grass grow under your feet, Mr Poirot. It will be a pleasure to work with you, I'm sure.

We're going to take that young gentleman's fingerprints as soon as we can lay hands upon him.' 'I can't help thinking you're mistaken. Inspector,' said Colonel Melrose warmly. 'I've known Ralph Paton from a boy upward. He'd never stoop to murder.' 'Maybe not,' said the inspector tonelessly.

'What have you got against him?' I asked.

'Went out just on nine o'clock last night. Was seen in the neighbourhood of Fernly Park somewhere about nine-thirty. Not been seen since. Believed to be in serious money difficulties. I've got a pair of his shoes here - shoes with rubber studs in them. He had two pairs, almost exactly alike. I'm going up now to compare them with those footmarks. The constable is up there seeing that no one tampers with them.' 'We'll go at once,' said Colonel Melrose. 'You and M.

Poirot will accompany us, will you not?' We assented, and all drove up in the colonel's car. The inspector was anxious to get at once to the footmarks, and asked to be put down at the lodge. About half-way up the drive, on the right, a path branched off which led round to the terrace and the window of Ackroyd's study.