"But--"

"It is possible to gain control of such a being."

"By what means?"

"By unhallowed means; yet there are those who do not hesitate to employ them. The danger of such an operation is, of course, enormous."

"I perceive, Dr. Cairn, that a theory, covering the facts of my recent experiences, is forming in your mind."

"That is so. In order that I may obtain corroborative evidence, I should like to call at your place this evening. Suppose I come ostensibly to see Lady Lashmore?"

Lord Lashmore was watching the speaker.

"There is someone in my household whose suspicions you do not wish to arouse?" he suggested.

"There is. Shall we make it nine o'clock?"

"Why not come to dinner?"

"Thanks all the same, but I think it would serve my purpose better if I came later."

Dr. Cairn and his son dined alone together in Half-Moon Street that night.

"I saw Antony Ferrara in Regent Street to-day," said. Robert Cairn. "I was glad to see him."

Dr. Cairn raised his heavy brows.

"Why?" he asked.

"Well, I was half afraid that he might have left London."

"Paid a visit to Myra Duquesne in Inverness?"

"It would not have surprised me."

"Nor would it have surprised me, Rob, but I think he is stalking other game at present."

Robert Cairn looked up quickly.

"Lady Lashmore," he began--

"Well?" prompted his father.

"One of the Paul Pry brigade who fatten on scandal sent a veiled paragraph in to us at _The Planet_ yesterday, linking Ferrara's name with Lady Lashmores.' Of course we didn't use it; he had come to the wrong market; but--Ferrara was with Lady Lashmore when I met him to-day."

"What of that?"

"It is not necessarily significant, of course; Lord Lashmore in all probability will outlive Ferrara, who looked even more pallid than usual."

"You regard him as an utterly unscrupulous fortune-hunter?"

"Certainly."

"Did Lady Lashmore appear to be in good health?"

"Perfectly."

"Ah!"

A silence fell, of some considerable duration, then:

"Antony Ferrara is a menace to society," said Robert Cairn. "When I meet the reptilian glance of those black eyes of his and reflect upon what the man has attempted--what he has done--my blood boils. It is tragically funny to think that in our new wisdom we have abolished the only laws that could have touched him! He could not have existed in Ancient Chaldea, and would probably have been burnt at the stake even under Charles II.; but in this wise twentieth century he dallies in Regent Street with a prominent society beauty and laughs in the face of a man whom he has attempted to destroy!"

"Be very wary," warned Dr. Cairn. "Remember that if you died mysteriously to-morrow, Ferrara would be legally immune. We must wait, and watch. Can you return here to-night, at about ten o'clock?"

"I think I can manage to do so--yes."

"I shall expect you. Have you brought up to date your record of those events which we know of, together with my notes and explanations?"

"Yes, sir, I spent last evening upon the notes."

"There may be something to add. This record, Rob, one day will be a weapon to destroy an unnatural enemy. I will sign two copies to-night and lodge one at my bank."

CHAPTER X

THE LAUGHTER

Lady Lashmore proved to be far more beautiful than Dr. Cairn had antic.i.p.ated. She was a true brunette with a superb figure and eyes like the darkest pa.s.sion flowers. Her creamy skin had a golden quality, as though it had absorbed within its velvet texture something of the sunshine of the South.

She greeted Dr. Cairn without cordiality.

"I am delighted to find you looking so well, Lady Lashmore," said the doctor. "Your appearance quite confirms my opinion."

"Your opinion of what, Dr. Cairn?"

"Of the nature of your recent seizure. Sir Elwin Groves invited my opinion and I gave it."

Lady Lashmore paled perceptibly.

"Lord Lashmore, I know," she said, "was greatly concerned, but indeed it was nothing serious--"

"I quite agree. It was due to nervous excitement."