"But why telephone at all?" demanded Melrose. "That is what I find so extraordinary. There seems no rhyme or reason in the thing."

"Naturally, but I'm not over sanguine as to the result. You know what that station is like."

I did. King's Abbot is a mere village, but its station happens to be an important junction. Most of the big expresses stop there, and trains are shunted, re-sorted, and made up. It has two or three public telephone boxes. At that time of night, three local trains come in close upon each other, to catch the connection with the express for the north which comes in at 10.19 and leaves at 10.23. The whole place is in a bustle, and the chances of one particular person being noticed telephoning or getting into the express are very small indeed.

"You'll have inquiries made at the station, of course?" I said.

Poirot carefully straightened a china ornament on one of the bookcases.

"Be sure there was a reason," he said over his shoulder.

We looked at each other.

"But what reason could it be?"

He went to the window and stood there looking out.

"When we know that, we shall know everything. This case is very curious and very interesting." There was something almost indescribable in the way he said those last words. I felt that he was looking at the case from some peculiar angle of his own, and what he saw I could not tell.

"You say it was nine o'clock, Dr Sheppard, when you met this stranger outside the gate?" He asked the question without turning round.

"Yes," I replied. "I heard the church clock chime the hour."

"How long would it take him to reach the house -- to reach this window, for instance?"

"Five minutes at the outside. Two or three minutes only if he took the path at the right of the drive and came straight here."

"But to do that he would have to know the way. How can I explain myself? -- it would mean that he had been here before -- that he knew his surroundings."

"That is true," replied Colonel Melrose.

"We could find out, doubtless, if Mr Ackroyd had received any strangers during the past week?"

"Or Parker," suggested Colonel Melrose.

"Young Raymond could tell us that," I said.

Colonel Melrose returned almost immediately, accompanied by the young secretary, whom he introduced to Poirot. Geoffrey Raymond was fresh and debonair as ever. He seemed surprised and delighted to make Poirot's acquaintance.

Colonel Melrose went in search of Raymond, and I rang the bell once more for Parker.

"M. Raymond, this chair was pulled out -- so -- last night when Mr Ackroyd was found killed. Someone moved it back again into place. Did you do so?"

"from tons les deux," suggested Poirot, smiling.

"No idea you'd been living among us incognito, M. Poirot," he said. "It will be a great privilege to watch you at work -- Hallo, what's this?"

"Want me to sit in the chair whilst you take a blood test?" asked Raymond good-humouredly. "What's the idea?"

Poirot had been standing just to the left of the door. Now he moved aside suddenly, and I saw that while my back was turned he must have swiftly drawn out the arm-chair till it stood in the position Parker had indicated.

The secretary's reply came without a second's hesitation. "No, indeed I didn't. I don't even remember that it was in that position, but it must have been if you say so. Anyway, somebody else must have moved it back to its proper place. Have they destroyed a clue in doing so? Too bad!"

The secretary reflected for a minute or two, knitting his brows, and during the pause Parker appeared in answer to the bell.

"It is of no consequence," said the detective. "Of no consequence whatever. What I really want to ask you is this, M. Raymond: Did any stranger come to see Mr Ackroyd during this past week?"

"I beg your pardon, sir?"

"No," said Raymond at last. "I can't remember anyone. Can you, Parker?"

"Any stranger coming to see Mr Ackroyd this week?"

"Oh! yes, I remember, but that is not the kind of stranger this gentleman means." He turned to Poirot. "Mr Ackroyd had some idea of purchasing a dictaphone," he explained. "It would have enabled us to get through a lot more work in a limited time. The firm in question sent down their representative, but nothing came of it. Mr Ackroyd did not make up his mind to purchase."

Raymond moved this aside with an impatient hand.

The butler reflected for a minute or two. "There was the young man who came on Wednesday, sir," he said at last. "From Curtis and Troute, I understood he was."

"It is a busy time for this young M. Raymond," murmured M. Poirot. "He has the air efficient, that one."

"He was fair-haired, sir, and short. Very neatly dressed in a blue serge suit. A very presentable young man, sir, for his station in life."

"His duties he fulfils punctiliously. Of that I am sure. In what manner does he amuse himself? Does he go in for le sporty?"

"There is nothing in that, then," declared the Belgian. "I thank you, Parker."

Poirot turned to the butler. "Can you describe this young man to me, my good Parker?"

"The family solicitor, M. Poirot," said the latter.

The butler spoke to Raymond. "Mr Hammond has just arrived, sir," he said. "He is anxious to know if he can be of any service, and he would be glad to have a word with you."

"I'll come at once," said the young man. He hurried out.

"Yes," I said. "Somewhere about six feet, I should say."

Poirot turned to me. "The man you met outside the gate, doctor, was tall, was he not?"

"I believe Mr Ackroyd considered him a most able secretary."

"He has been here -- how long?"

"Just on two years, I fancy."

Poirot looked inquiringly at the chief constable.

Poirot nodded and seemed to lose interest. He glanced slowly round the study. "I have seen, I think, all that there is to be seen here."

"Race meetings? No, I don't think he's interested in racing."

I, too, looked round.

"Private secretaries haven't much time for that sort of thing," said Colonel Melrose, smiling. "Raymond plays golf, I believe. And tennis in the summer time."

"If those walls could speak," I murmured.

"He does not attend the courses -1 should say the running of the horses?"

"An opened window," he said. "A locked door. A chair that apparently moved itself. To all three I say "Why?" and I find no answer." He shook his head, puffed out his chest, and stood blinking at us. He looked ridiculously full of his own importance.

Poirot shook his head. "A tongue is not enough," he said. They would have to have also eyes and ears. But do not be too sure that these dead things' -- he touched the top of the bookcase as he spoke -- "are always dumb. To me they speak sometimes -- chairs, tables -- they have their message!" He turned away towards the door.

He looked over his shoulder and raised one eyebrow quizzically.

"What message?" I cried. "What have they said to you today?"

I think the same thought must have occurred to Colonel Melrose, for he frowned.

"You would perhaps be so kind as to show me the silver table from which the weapon was taken? After that, I will trespass on your kindness no longer."

We went to the drawing-room, but on the way the constable waylaid the colonel, and after a muttered conversation the latter excused himself and left us together. I showed Poirot the silver table, and after raising the lid once or twice and letting it fall, he pushed open the window and stepped out on the terrace. I followed him.

It crossed my mind to wonder whether he was really any good as a detective. Had his big reputation been built up on a series of lucky chances?

"Anything more you want to see, M. Poirot?" he inquired brusquely.

Inspector Raglan had just turned the corner of the house, and was coming towards us. His face looked grim and satisfied.

"So there you are, M. Poirot," he said. "Well, this isn't going to be much of a case. I'm sorry, too. A nice enough young fellow gone wrong."

Poirot's gaze took on an admiring quality. "You have been of a marvellous promptness," he observed. "How exactly did you go to work, if I may ask?"

"The cells?" said the inspector, staring.

"Certainly," said the inspector. "To begin with -- method. That's what I always say -- method!"

"Ah!" cried the other. "That, too, is my watchword. Method, order, and the little grey cells."

"Ah!" said the inspector, "you've been bitten with all this psycho-analysis stuff? Now, I'm a plain man --"

"Oh, of course; well, we all use them, I suppose."

"Next time, perhaps," said the inspector soothingly. "Though we don't have murders every day in this quiet little corner of the world."

"Mrs Raglan would not agree, I am sure, to that," said Poirot, making him a little bow.

"The little grey cells of the brain," explained the Belgian.

"In a greater or lesser degree," murmured Poirot. "And there are, too, differences in quality. Then there is the psychology of a crime. One must study that."

Poirot's face fell, and he spoke very mildly. "I'm afraid I shall not be able to be of much aid to you, then?"

"You don't understand," he said, grinning broadly. "Lord, what a lot of difference language makes. I'm telling you how I set to work. First of all, method. Mr Ackroyd was last seen alive at a quarter to ten by his niece. Miss Flora Ackroyd. That's fact number one, isn't it?"

Inspector Raglan, a little taken aback, bowed.

"If you say so."

"Well, it is. At half-past ten, the doctor here says that Mr Ackroyd had been dead at least half an hour. You stick to that, doctor?"

"Certainly," I said. "Half an hour or longer."

He handed a sheet of paper to Poirot. I read it over his shoulder. It ran as follows, written in a neat script:

"Very good. That gives us exactly a quarter of an hour in which the crime must have been committed. I make a list of everyone in the house, and work through it, setting down opposite their names where they were and what they were doing between the hour of 9.45 and 10 p. m."

Major Blunt. -- In billiard room with Mr Raymond. (Latter confirms.)

Mr Raymond. -- Billiard room. (See above.)

Mary Thripp (kitchenmaid). -- Servants' Hall.

Parker. -- Went straight to butler's pantry. (Confirmed by housekeeper. Miss Russell, who came down to speak to him about something at 9.47, and remained at least ten minutes.)

Miss Russell. -- As above. Spoke to housemaid, Elsie Dale, upstairs at 9.45.

Mrs Cooper (cook). -- In Servants' Hall.

"A very complete list," said Poirot, handing it back to him. "I am quite sure that Parker did not do the murder," he added gravely.

Gladys Jones (second housemaid). -- In Servants' Hall.

Ursula Bourne (parlourmaid). -- In her own room until 9.55. Then in Servants' Hall.

"The cook has been here seven years, the parlourmaid eighteen months, and Parker just over a year. The others are new. Except for something fishy about Parker, they all seem quite all right."

Servants:

Miss Ackroyd. -- Went straight from her uncle's room upstairs. (Confirmed by Parker, also housemaid, Elsie Dale.)

Elsie Dale. -- Upstairs in bedroom. Seen there by Miss Russell and Miss Flora Ackroyd.

Mrs Ackroyd. -- 9.45 watching billiard match. Went up to bed 9.55. (Raymond and Blunt watched her up staircase.)

"Exactly twenty-five minutes past nine," said the inspector gravely.

"She is sure of that?" I asked sharply.

"That disposes pretty effectually of the household," continued the inspector. "Now we come to a very grave point. The woman at the lodge -- Mary Black -- was pulling the curtains last night when she saw Ralph Paton turn in at the gate and go up towards the house."

"So is my sister," I struck in. "And she's usually right." Nobody paid any attention to my interpolation.

"Quite sure. She knows him well by sight. He went past very quickly and turned off by the path to the right, which is a short cut to the terrace."

"And what time was that?" asked Poirot, who had sat with an immovable face.

There was a silence. Then the inspector spoke again. "It's all clear enough. It fits in without a flaw. At twenty-five minutes past nine. Captain Paton is seen passing the lodge; at nine-thirty or thereabouts, Mr Geoffrey Raymond hears someone in here asking for money and Mr Ackroyd refusing. What happens next? Captain Paton leaves the same way -- through the window. He walks along the terrace, angry and baffled. He comes to the open drawing-room window. Say it's now a quarter to ten. Miss Flora Ackroyd is saying goodnight to her uncle. Major Blunt, Mr Raymond, and Mrs Ackroyd are in the billiard room. The drawing-room is empty. He steals in, takes the dagger from the silver table, and returns to the study window. He slips off his shoes, climbs in, and -- well, I don't need to go into details. Then he slips out again and goes off. Hadn't the nerve to go back to the inn. He makes for the station, rings up from there"

I jumped at the interruption. The little man was leaning forward. His eyes shone with a queer green light.

"Why?" said Poirot softly.

We followed him round the corner of the terrace to the study window. At a word from Raglan a police constable produced the shoes which had been obtained from the local inn.

The inspector laid them over the marks.

For a moment Inspector Raglan was taken aback by the question. "It's difficult to say exactly why he did that," he said at last. "But murderers do funny things. You'd know that if you were in the police force. The cleverest of them make stupid mistakes sometimes. But come along and I'll show you those footprints."

"They're the same," he said confidently. "That is to say, they're not the same pair that actually made these prints. He went away in those. This is a pair just like them, but older see how the studs are worn down?"

"Surely a great many people wear shoes with rubber studs in them?" asked Poirot.

"That's so, of course," said the inspector. "I shouldn't put so much stress on the footmarks if it wasn't for everything else."

The inspector laughed.

"Ah! well," said the inspector, "it was a dry, fine night, you know. He left no prints on the terrace or on the gravelled path. But, unluckily for him, a spring must have welled up just lately at the end of the path from the drive. See here."

A small gravelled path joined the terrace a few feet away. In one spot, a few yards from its termination, the ground was wet and boggy. Crossing this wet place there were again the marks of footsteps, and amongst them the shoes with rubber studs.

Poirot followed the path on a little way, the inspector by his side. "You noticed the women's footprints?" he said suddenly.

"A very foolish young man. Captain Ralph Paton," said Poirot thoughtfully. "To leave so much evidence of his presence."

"Naturally. But several different women have walked this way -- and men as well. It's a regular short cut to the house, you see. It would be impossible to sort out all the footsteps. After all, it's the ones on the window-sill that are really important."

Poirot nodded.

Again Poirot nodded, but his eyes were fixed on a small garden house -- a kind of superior summer-house. It was a little to the left of the path ahead of us, and a gravelled walk ran up to it.

Poirot lingered about until the inspector had gone back towards the house. Then he looked at me.

I was startled to observe my new friend. He had dropped to his hands and knees and was crawling about the floor. Every now and then he shook his head as though not satisfied. Finally, he sat back on his heels.

"You must have indeed been sent from the good God to replace my friend Hastings," he said, with a twinkle. "I observe that you do not quit my side. How say you. Doctor Sheppard, shall we investigate that summer-house? It interests me."

"It's no good going farther," said the inspector, as we came in view of the drive. "It's all gravelled again here, and hard as it can be."

He went up to the door and opened it. Inside, the place was almost dark. There were. one or two rustic seats, a croquet set, and some folded deck-chairs.

"A fragment of a handkerchief?" he mused. "Perhaps you are right. But remember this -- a good laundry does not starch a handkerchief." He nodded at me triumphantly, then he put away the scrap carefully in his pocketbook.

He made another dart and picked up a small quill -- a goose quill by the look of it.

"What do you make of it, eh, my friend?" he asked, eyeing me keenly.

I took it from him, looked at it curiously, and then handed it back.

He smiled, unclosing his hand so that I should see what lay in the palm of it. A scrap of stiff white cambric.

"Nothing," he murmured. "Well, perhaps it was not to be expected. But it would have meant so much --"

"What is it?" I cried. "What have you found?"

"And that?" he cried triumphantly. "What do you make of that?"

He slipped the quill into his pocket, and looked again at the scrap of white stuff.

He broke off, stiffening all over. Then he stretched out his hand to one of the rustic chairs. He detached something from one side of it.

I only stared.

"A scrap torn from a handkerchief," I suggested, shrugging my shoulders.