‘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 highclass 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.

‘Would you like to go with the inspector, M. Poirot,’ asked the chief constable, ‘or would you prefer to examine the study?’

Poirot chose the latter alternative. Parker opened the door to us. his manner was smug and deferential, and he seemed to have recovered from his panic of the night before.

Colonel Melrose took a key from his pocket, and unlocking the door which led into the lobby, he ushered us through into the study.

‘Except for the removal of the body, M. Poirot, this room is exactly as it was last night.’

‘And the body was found – where?’

As precisely as possible, I described Ackroyd’s position. The armchair still stood in front of the fire. Poirot went and sat down in it.

‘The blue letter you speak of, where was it when you left the room?’

‘Mr Ackroyd had laid it down on this little table at his right hand.’

Poirot nodded.

‘Except for that, everything was in its place?’

‘Yes, I think so.’

‘Colonel Melrose, would you be so extremely obliging as to sit down in this chair a minute. I thank you. Now M. le docteur, will you kindly indicate to me the exact position of the dagger?’

I did so, whilst the little man stood in the doorway.

‘The hilt of the dagger was plainly visible from the door then. Both you and Parker could see it at once?’

‘Yes.’

Poirot went next to the window.

‘The electric light was on, of course, when you discovered the body?’ he asked over his shoulder.

I assented, and joined him where he was studying the marks on the window-sill.

‘The rubber studs are the same pattern as those in captain Paton’s shoes,’ he said quietly.

Then he came back once more to the middle of the room. his eye travelled round, searching everything in the room with a quick, trained glance.

‘Are you a man of good observation, doctor Sheppard?’ he asked at last.

‘I think so,’ I said, surprised.

‘There was a fire in the grate, I see. When you broke the door down and found Mr Ackroyd dead, how was the fire? Was it low?’

I gave a vexed laugh.

‘I–I really can’t say. I didn’t notice. Perhaps Mr Raymond or Major Blunt-’

The little man opposite me shook his head with a faint smile.

‘One must always proceed with method. I made an error of judgment in asking you that question. To each man his own knowledge. you could tell me the details of the patient’s appearance – nothing there would escape you. If I wanted information about the papers on that desk, Mr Raymond would have noticed anything there was to see. To find out about the fire, I must ask the man whose business it is to observe such things. you permit-’

He moved swiftly to the fireplace and rang the bell.

After a lapse of a minute or two Parker appeared.

‘The bell rang, sir,’ he said hesitatingly.

‘Come in, Parker,’ said colonel Melrose. ‘This gentleman wants to ask you something.’

Parker transferred a respectful attention to Poirot.

‘Parker,’ said the little man, ‘when you broke down the door with dr Sheppard last night, and found your master dead, what was the state of the fire?’

Parker replied without a pause.

‘It had burned very low, sir. It was almost out.’

‘Ah!’ said Poirot. The exclamation sounded almost triumphant. he went on: ‘Look round you, my good Parker. Is this room exactly as it was then?’

The butler’s eye swept round. It came to rest on the windows.

‘The curtains were drawn, sir, and the electric light was on.’

Poirot nodded approval.

‘Anything else?’

‘Yes, sir, this chair was drawn out a little more.’ he indicated a big grandfather chair to the left of the door between it and the window. I append a plan of the room with the chair in question marked with an X.

‘Just show me,’ said Poirot.

The butler drew the chair in question out a good two feet from the wall, turning it so that the seat faced the door.

‘Voilà ce qui est curieux,’ murmured Poirot. ‘No one would want to sit in a chair in such a position, I fancy. Now who pushed it back into place again, I wonder? did you, my friend?’

‘No, sir,’ said Parker. ‘I was too upset with seeing the master and all.’

Poirot looked across at me.

‘Did you, doctor?’

I shook my head.

‘It was back in position when I arrived with the police, sir,’ put in Parker. ‘I’m sure of that.’

‘Curious,’ said Poirot again.

‘Raymond or Blunt must have pushed it back,’ I suggested. ‘Surely it isn’t important?’

‘It is completely unimportant,’ said Poirot. ‘That is why it is so interesting,’ he added softly.

‘Excuse me a minute,’ said colonel Melrose. he left the room with Parker.

‘Do you think Parker is speaking the truth?’ I asked.

‘About the chair, yes. otherwise I do not know. you will find, M. le docteur, if you have much to do with cases of this kind, that they all resemble each other in one thing.’

‘What is that?’ I asked curiously.

‘Everyone concerned in them has something to hide.’

‘Have I?’ I asked, smiling.

Poirot looked at me attentively.

‘I think you have,’ he said quietly.

‘But-’

‘Have you told me everything known to you about this young man Paton?’ He smiled as I grew red. ‘Oh! do not fear. I will not press you. I shall learn it in good time.’

‘I wish you’d tell me something of your methods,’ I said hastily, to cover my confusion. ‘The point about the fire, for instance?’

‘Oh! That was very simple. You leave Mr Ackroyd at – ten minutes to nine, was it not?’

‘Yes, exactly, I should say.’

‘The window is then closed and bolted and the door unlocked. At a quarter past ten when the body is discovered, the door is locked and the window is open. Who opened it? Clearly only Mr Ackroyd himself could have done so, and for one of two reasons. Either because the room became unbearably hot, but since the fire was nearly out and there was a sharp drop in temperature last night, that cannot be the reason, or because he admitted someone that way. And if he admitted someone that way, it must have been someone well known to him, since he had previously shown himself uneasy on the subject of that same window.’

‘It sounds very simple,’ I said.

‘Everything is simple, if you arrange the facts methodically. We are concerned now with the personality of the person who was with him at nine-thirty last night. everything goes to show that that was the individual admitted by the window, and though Mr Ackroyd was seen alive later by Miss Flora, we cannot approach a solution of the mystery until we know who that visitor was. The window may have been left open after his departure and so afforded entrance to the murderer, or the same person may have returned a second time. Ah! here is the colonel who returns.’

Colonel Melrose entered with an animated manner.

‘That telephone call has been traced at last,’ he said. ‘It did not come from here. It was put through to Dr Sheppard at 10.15 last night from a public call office at king’s Abbot station. And at 10.23 the night mail leaves for Liverpool.’