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"Negative theory?"

"Exactly. We are dealing, my dear fellow, with a case of bewildering intricacies. For the moment I have focussed upon one feature only."

"What is that?"

"Upon proving that Colin Camber did not do the murder."

"Did _not_ do it?"

"Precisely, Knox. Respecting the person or persons who did do it, I had preserved a moderately open mind, up to the moment that Inspector Aylesbury entered the library with the Lee-Enfield."

"And then?" I said, eagerly.

"Then," he replied, "I began to think hard. However, since I practise what I preach, or endeavour to do so, I must not permit myself to speculate upon this aspect of the matter until I have tested my theory of Camber's innocence."

"In other words," I said, bitterly, "although you encouraged me to unfold my ideas regarding Mrs. Camber, you were merely laughing at me all the time!"

"My dear Knox!" exclaimed Harley, jumping up impulsively, "please don't be unjust. Is it like me? On the contrary, Knox"--he looked me squarely in the eyes--"you have given me a platform on which already I have begun to erect one corner of a theory of the crime. Without new facts I can go no further. But this much at least you have done."

"Thanks, Harley," I murmured, and indeed I was gratified; "but where do your other corners rest?"

"They rest," he said, slowly, "they rest, respectively, upon a bat wing, a yew tree, and a Lee-Enfield charger-loader."

CHAPTER XXX

THE SEVENTH YEW TREE

Detective-Inspector Wessex arrived at about five o'clock; a quiet, resourceful man, highly competent, and having the appearance of an ex- soldier. His respect for the attainments of Paul Harley alone marked him a student of character. I knew Wessex well, and was delighted when Pedro showed him into the library.

"Thank God you are here, Wessex," said Harley, when we had exchanged greetings. "At last I can move. Have you seen the local officer in charge?"

"No," replied the Inspector, "but I gather that I have been requisitioned over his head."

"You have," said Harley, grimly, "and over the head of the Chief Constable, too. But I suppose it is unfair to condemn a man for the shortcoming with which nature endowed him, therefore we must endeavour to let Inspector Aylesbury down as lightly as possible. I have an idea that I heard him return a while ago."

He walked out into the hall to make enquiries, and a few moments later I heard Inspector Aylesbury's voice.

"Ah, there you are, Inspector Aylesbury," said Harley, cheerily. "Will you please step into the library for a moment?"

The Inspector entered, frowning heavily, followed by my friend.

"There is no earthly reason why we should get at loggerheads over this business," Harley continued; "but the fact of the matter is, Inspector Aylesbury, that there are depths in this case to which neither you nor I have yet succeeded in penetrating. You have a reputation to consider, and so have I. Therefore I am sure you will welcome the cooperation of Detective-Inspector Wessex of Scotland Yard, as I do."

"What's this, what's this?" said Aylesbury. "I have made no application to London."

"Nevertheless, Inspector, it is quite in order," declared Wessex. "I have my instructions here, and I have reported to Market Hilton already. You see, the man you have detained is an American citizen."

"What of that?"

"Well, he seems to have communicated with his Embassy." Wessex glanced significantly at Paul Harley. "And the Embassy communicated with the Home Office. You mustn't regard my arrival as any reflection on your ability, Inspector Aylesbury. I am sure we can work together quite agreeably."

"Oh," muttered the other, in evident bewilderment, "I see. Well, if that's the way of it, I suppose we must make the best of things."

"Good," cried Wessex, heartily. "Now perhaps you would like to state your case against the detained man?"

"A sound idea, Wessex," said Paul Harley. "But perhaps, Inspector Aylesbury, before you begin, you would be good enough