And, while the light from a rain-blurred window inperceptibly thickened and grew cold upon the face of Dr. Hart’s patient, he answered Alleyn’s questions. Alleyn had had official dealings with aliens for many years. Since the onset of Nazidom he had learned to recognize a common and tragic characteristic in many of them, and that was a deep-seated terror of plainclothes police officers. Dr. Hart’s attitude surprised him very much. As he carried forward his questions he found that in the face of what appeared to be an extremely nasty position, Hart showed little nervousness. He answered readily but with a suggestion of impatience. Alleyn was more than usually careful to give him the official warnings. Hart listened to them with an air of respect, nodding his head gravely but showing no inclination to consider his answers more carefully. If he was indeed innocent, he was the ideal witness, but in this case his belief in his own safety was alarming. If he was guilty, he was a very cool customer indeed. Alleyn decided to try him a little further.

“It comes to this, then,” he said. “You can offer no explanation of how this extra Charter form, containing the warning, reached Mr. Compline. Nor have you any theory as to who pushed Mr. Mandrake into the pond, though you agree that you saw Mr. Compline leave for the pond wearing precisely the same kind of cape. Is that right?”

“It is true that I do not know who pushed Mr. Mandrake into the pond,” said Hart slowly. “As for the Charter form, I suggested at the time that I might have torn two forms off together and that the bottom form had been written by somebody else.”

“Someone who made letters reminiscent of your own writing?”

“I have not seen the form. I do not know what was written on it.

“Five words. ‘You are warned. Keep off.’ ”

A dull red crept into those heavy cheeks. For the first time he seemed disconcerted. For the first time Alleyn saw the nervous tic flutter under his lip.

“Dr. Hart,” Alleyn said, “of all the people in that room, who had most cause to send such a message to Nicholas Compline?”

“Two people had cause. His brother and myself. His brother had cause. Had he not practised his goat’s tricks upon the girl, the brother’s fiancée?”

“And only on her?” Hart was silent. “Is it true,” Alleyn asked, “that you had written to Nicholas Compline, objecting to his friendship with your wife and threatening to take certain steps if this friendship continued?”

“Did he tell you that?” Hart demanded.

“I haven’t seen him yet, but if you wrote such letters he’s not likely to keep it a secret.”

“I do not deny that I wrote them. I deny that I wrote this ridiculous message. And I object most strongly to the introduction into this affair of matters that concern only myself.”

“If they prove to be irrelevant they will not be made public. Dr. Hart, you tell me you have nothing to fear and nothing to conceal from me. At the same time you don’t deny that you threatened Nicholas Compline. I must tell you that I’ve had a very full account of this week-end from a member of your party. I’ve warned you that your statements, if relevant, may be used in subsequent proceedings. I’m going to ask you certain questions and I shall do my best to check your answers. We shall get on a good deal faster if you don’t challenge my questions, but either refuse or consent to give plain answers to them.”

There was a pause and then Hart said hurriedly: “Very well, very well. I do not seek to obstruct you. It is only that there is one matter that is most painful to me. Unendurably painful.”

“I’m sorry. Do you agree that you were at enmity with Compline?”

“I objected to his behavior in regard to — my wife.”

“Did he know she was your wife?”

“I desired to tell him so.”

“But you didn’t tell him?”

“No. My wife did not wish me to do so.”

“Have you quarrelled with him since you came to Highfold?”

“Yes. Openly. I have not attempted to conceal my mistrust and dislike of him. Would a man who was planning a murder behave in such a manner? Would he not rather simulate friendship?”

Alleyn looked at the pale face with its twitching lip. “If he was in full command of his emotions, no doubt he would attempt to do so.” Hart found no answer to this and he went on: “Did you meet anyone on your way from the house to the pond?”

“No.”

“I have had a very brief look at that part of the garden. You went by a path that comes out at the back of the pavilion?”

“Yes.”

“What did you see as you came round the pavilion?”

“I heard shouts and I saw William Compline, Nicholas Compline, Miss Wynne and Mr. Royal gesticulating on the edge of the pond.”

“Yesterday evening when you came upstairs to dress, did you see anybody after you went to your room?”

“Nobody.”

“Have you ever touched the brass Buddha that injured Nicholas Compline?”

“Never. But — wait a moment… Yes. Yes, my God, I have touched it!”

“When?”

“It was the first night. We went up to our rooms. I remember I drew back because I did not wish to accompany Nicholas Compline, who walked a little ahead with his brother. Mr. Royal drew my attention to this Buddha. He asked me if I knew anything of Oriental art. As an excuse to delay, I feigned an interest. I reached out my hands and touched it. Compline made some remark on the obesity of the Buddha. It was an insult to me. Whenever he could insult me he did so. So I have touched it.”

“Coming back to last night. Will you describe your movements from the time you entered the green ‘boudoir’ until the time you went upstairs for the last time?”

Hart did this and his description tallied with Mandrake’s note. “I felt I could not dine with them. They suspected me. It was an intolerable situation. I spoke to Mr. Royal and he suggested that I remain in that room. When, as I have told you, I finally left it, it was the first time. I went straight to my room. The footman saw me.”

“Had you been into the smoking-room at any time yesterday?”

“I do not think so. That insufferable machine was there. In the morning he had driven me crazy with it. First one horrible noise, then another, and all of them distorted. I cannot endure radio. I have a radio-phobia. I did not go into the room at all yesterday.”

“But you have been there at some time?”

“Oh, yes. The first night we played this Charter game in that room.”

“Will you describe the room to me?”

“Describe it? But you have seen it? Why should I?”

“I should like you to do so if you will.”

Hart stared at Alleyn as if he were insane and began a laborious catalogue. “First, then, if you must have it, there is this detestable radio close to the ‘boudoir’ door. When I think of the room I think of the radio by which it is made hideous. There are English leather chairs. There is a red leather screen. There are pictures, English sportings, I think. And photographs, very old and faded. There is such a photograph above the mantelpiece of an old fellow with a fish. He wears an absurd costume. There is also hanging on the wall a fishing-rod. Surely this is a great waste of time, Inspector.”

“Are you a fisherman?”

“Gott im Himmel, of what importance is it whether I fish or do not fish! I do not fish. I know nothing of fishing.” Hart stared irritably at Alleyn and then added: “If I lose my temper you will forgive me. I have heard of the efficiency of Scotland Yard. No doubt there is some reason which I do not follow for these questions of interior decoration and fishing. I can tell you little more of the room. I did not particularly observe this room.”

“The colour of the walls?”

“A light colour. A neutral colour. Almost white.”

“And the carpet?”

“I cannot tell you — dark. Green, I think. Dark green. There are, of course, three doors. The one into the ‘boudoir’ was locked by Nicholas Compline after I requested that he should not use that machine of hell.”