Melchett shook his head.

"Slack didn't find anything of the kind, and he asked Redding, and Redding didn't seem to know what he was talking about at first and then denied point blank using anything of the kind. And I suppose one can take his word for it."

"Yes, indeed, poor devil."

"Damned young fool," said Colonel Melchett. "Sorry, Clement. But he really is! Somehow one can't get used to thinking of him as a murderer."

"Any motive?" asked Haydock, taking a final draught of coffee and pushing back his chair.

"He says they quarrelled and he lost his temper and shot him."

"Hoping for manslaughter, eh?" The doctor shook his head. "That story doesn't hold water. He stole up behind him as he was writing and shot him through the head. Precious little 'quarrel' about that."

"Anyway, there wouldn't have been time for a quarrel," I said, remembering Miss Marple's words. "To creep up, shoot him, alter the clock hands back to 6.20, and leave again would have taken him all his time. I shall never forget his face when I met him outside the gate, or the way he said, 'You want to see Protheroe - oh! you'll see him all right!' That in itself ought to have made me suspicious of what had just taken place a few minutes before."

Haydock stared at me.

"What do you mean - what had just taken place? When do you think Redding shot him?"

"A few minutes before I got to the house."

The doctor shook his head.

"Impossible. Plumb impossible. He'd been dead much longer than that."

"But, my dear man," cried Colonel Melchett, "you said yourself that half an hour was only an approximate estimate."

"Half an hour, thirty-five minutes, twenty-five minutes, twenty minutes - possibly, but less, no. Why, the body would have been warm when I got to it."

We stared at each other. Haydock's face had changed. It had gone suddenly grey and old. I wondered at the change in him.

"But, look here, Haydock." The colonel found his voice. "If Redding admits shooting him at a quarter to seven -"

Haydock sprang to his feet.

"I tell you it's impossible," he roared. "If Redding says he killed Protheroe at a quarter to seven, then Redding lies. Hang it all, I tell you I'm a doctor, and I know. The blood had begun to congeal."

"If Redding is lying," began Melchett. He stopped, shook his head.

"We'd better go down to the police station and see him," he said.

We were rather silent on our way down to the police station. Haydock drew behind a little and murmured to me:

"You know I don't like the look of this. I don't like it. There's something here we don't understand."

He looked thoroughly worried and upset.

Inspector Slack was at the police station and presently we found ourselves face to face with Lawrence Redding.

He looked pale and strained but quite composed - marvellously so, I thought, considering the circumstances. Melchett snorted and hummed, obviously nervous.

"Look here, Redding," he said, "I understand you made a statement to Inspector Slack here. You state you went to the Vicarage at approximately a quarter to seven, found Protheroe there, quarrelled with him, shot him, and came away. I'm not reading it over to you, but that's the gist of it."

"Yes."

"I'm going to ask a few questions. You've already been told that you needn't answer them unless you choose. Your solicitor -"

Lawrence interrupted.

"I've nothing to hide. I killed Protheroe."

"Ah! well -" Melchett snorted. "How did you happen to have a pistol with you?"

Lawrence hesitated. "It was in my pocket."

"You took it with you to the Vicarage?"

"Yes."

"Why?"

"I always take it."

He had hesitated again before answering, and I was absolutely sure that he was not speaking the truth.

"Why did you put the clock back?"

"The clock?" He seemed puzzled.

"Yes, the hands pointed to 6.22."

A look of fear sprang up in his face.

"Oh! that - yes. I - I altered it."

Haydock spoke suddenly.

"Where did you shoot Colonel Protheroe?"

"In the study at the Vicarage."

"I mean in what part of the body?"

"Oh! - I - through the head, I think. Yes, through the head."

"Aren't you sure?"

"Since you know, I can't see why it is necessary to ask me." It was a feeble kind of bluster. There was some commotion outside. A constable without a helmet brought in a note.

"For the vicar. It says very urgent on it."

I tore it open and read:

"Please - please - come to me. I don't know what to do. It is all too awful. I want to tell someone. Please come immediately, and bring any one you like with you. - ANNE PROTHEROE.

I gave Melchett a meaning glance. He took the hint. We all went out together. Glancing over my shoulder, I had a glimpse of Lawrence Redding's face. His eyes were riveted on the paper in my hand, and I have hardly ever seen such a terrible look of anguish and despair in any human being's face.

I remembered Anne Protheroe sitting on my sofa and saying:

"I'm a desperate woman," and my heart grew heavy within me. I saw now the possible reason for Lawrence Redding's heroic self-accusation. Melchett was speaking to Slack.

"Have you got any line on Redding's movements earlier in the day? There's some reason to think he shot Protheroe earlier than he says. Get on to it, will you?"

He turned to me and without a word I handed him Anne Protheroe's letter. He read it and pursed up his lips in astonishment. Then he looked at me inquiringly.

"Is this what you were hinting at this morning? "

"Yes. I was not sure then if it was my duty to speak. I am quite sure now." And I told him of what I had seen that night in the studio.

The colonel had a few words with the inspector and then we set off for Old Hall. Dr. Haydock came with us.

A very correct butler opened the door, with just the right amount of gloom in his bearing.

"Good-morning," said Melchett. "Will you ask Mrs. Protheroe's maid to tell her we are here and would like to see her, and then return here and answer a few questions."

The butler hurried away and presently returned with the news that he had despatched the message.

"Now let's hear something about yesterday," said Colonel Melchett. "Your master was in to lunch?"

"Yes, sir."

"And in his usual spirits?"

"As far as I could see, yes, sir."

"What happened after that?"

"After luncheon Mrs. Protheroe went to lie down and the colonel went to his study. Miss Lettice went out to a tennis party in the two-seater. Colonel and Mrs. Protheroe had tea at four-thirty, in the drawing-room. The car was ordered for five-thirty to take them to the village. Immediately after they had left Mr. Clement rang up" - he bowed to me - "I told him they had started."

"H'm," said Colonel Melchett. "When was Mr. Redding last here?"

"On Tuesday afternoon, sir."

"I understand that there was a disagreement between them?"

"I believe so, sir. The colonel gave me orders that Mr. Redding was not to be admitted in future."

"Did you overhear the quarrel at all?" asked Colonel Melchett bluntly.

"Colonel Protheroe, sir, had a very loud voice, especially when it was raised in anger. I was unable to help overhearing a few words here and there."

"Enough to tell you the cause of the dispute?"

"I understood, sir, that it had to do with a portrait Mr. Redding had been painting - a portrait of Miss Lettice."

Melchett grunted.

"Did you see Mr. Redding when he left?"

"Yes, sir, I let him out."

"Did he seem angry?"

"No, sir; if I may say so, he seemed rather amused."

"Ah! He didn't come to the house yesterday?"

"No, sir."

"Any one else come?"