“Ah!” said Egbert, with the air of a man coming at last into a deferred inheritance of conversational importance, “that is precisely what I want to speak to you about.”

He pushed away his coffee cup and drew a pocket-book from his inner breast-pocket.  From the depths of the pocket-book he produced an envelope, and from the envelope he extracted a letter, closely written in a small, neat handwriting.

“One of the Canon’s numerous letters to Aunt Adelaide,” he explained, “written a few days before his death.  Her memory was already failing when she received it, and I daresay she forgot the contents as soon as she had read it; otherwise, in the light of what subsequently happened, we should have heard something of this letter before now.  If it had been produced at the inquest I fancy it would have made some difference in the course of affairs.  The evidence, as you remarked just now, choked off suspicion against Sebastien by disclosing an utter absence of anything that could be considered a motive or provocation for the crime, if crime there was.”

“Oh, read the letter,” said Sir Lulworth impatiently.

“It’s a long rambling affair, like most of his letters in his later years,” said Egbert.  “I’ll read the part that bears immediately on the mystery.

“’I very much fear I shall have to get rid of Sebastien.  He cooks divinely, but he has the temper of a fiend or an anthropoid ape, and I am really in bodily fear of him.  We had a dispute the other day as to the correct sort of lunch to be served on Ash Wednesday, and I got so irritated and annoyed at his conceit and obstinacy that at last I threw a cupful of coffee in his face and called him at the same time an impudent jackanapes.  Very little of the coffee went actually in his face, but I have never seen a human being show such deplorable lack of self-control.  I laughed at the threat of killing me that he spluttered out in his rage, and thought the whole thing would blow over, but I have several times since caught him scowling and muttering in a highly unpleasant fashion, and lately I have fancied that he was dogging my footsteps about the grounds, particularly when I walk of an evening in the Italian Garden.’

“It was on the steps in the Italian Garden that the body was found,” commented Egbert, and resumed reading.

“’I daresay the danger is imaginary; but I shall feel more at ease when he has quitted my service.’”

Egbert paused for a moment at the conclusion of the extract; then, as his uncle made no remark, he added:  “If lack of motive was the only factor that saved Sebastien from prosecution I fancy this letter will put a different complexion on matters.”

“Have you shown it to anyone else?” asked Sir Lulworth, reaching out his hand for the incriminating piece of paper.

“No,” said Egbert, handing it across the table, “I thought I would tell you about it first.  Heavens, what are you doing?”