“You don’t mean that you are yourself a collector?” His eyes danced with pleasure at the thought.

“You are certainly the very man in London for my purpose. I thought that among five millions of people there must be such a man, but the difficulty is to lay one’s hands upon him. I have been extraordinarily fortunate in finding you.”

He rang a gong upon the table, and the footman entered.

“Ask Lady Rossiter to have the goodness to step this way,” said his lordship, and a few moments later the lady was ushered into the room. She was a small, middle-aged woman, very like Lord Linchmere in appearance, with the same quick, alert features and gray-black hair. The expression of anxiety, however, which I had observed upon his face was very much more marked upon hers. Some great grief seemed to have cast its shadow over her features. As Lord Linchmere presented me she turned her face full upon me, and I was shocked to observe a half-healed scar extending for two inches over her right eyebrow. It was partly concealed by plaster, but none the less I could see that it had been a serious wound and not long inflicted.

“Dr. Hamilton is the very man for our purpose, Evelyn,” said Lord Linchmere. “He is actually a collector of beetles, and he has written articles upon the subject.”

“Really!” said Lady Rossiter. “Then you must have heard of my husband. Every one who knows anything about beetles must have heard of Sir Thomas Rossiter.”

For the first time a thin little ray of light began to break into the obscure business. Here, at last, was a connection between these people and beetles. Sir Thomas Rossiter—he was the greatest authority upon the subject in the world. He had made it his lifelong study, and had written a most exhaustive work upon it. I hastened to assure her that I had read and appreciated it.

“Have you met my husband?” she asked.

“No, I have not.”

“But you shall,” said Lord Linchmere, with decision.

The lady was standing beside the desk, and she put her hand upon his shoulder. It was obvious to me as I saw their faces together that they were brother and sister.

“Are you really prepared for this, Charles? It is noble of you, but you fill me with fears.” Her voice quavered with apprehension, and he appeared to me to be equally moved, though he was making strong efforts to conceal his agitation.

“Yes, yes, dear; it is all settled, it is all decided; in fact, there is no other possible way, that I can see.”

“There is one obvious way.”

“No, no, Evelyn, I shall never abandon you—never. It will come right—depend upon it; it will come right, and surely it looks like the interference of Providence that so perfect an instrument should be put into our hands.”

My position was embarrassing, for I felt that for the instant they had forgotten my presence. But Lord Linchmere came back suddenly to me and to my engagement.

“The business for which I want you, Dr. Hamilton, is that you should put yourself absolutely at my disposal. I wish you to come for a short journey with me, to remain always at my side, and to promise to do without question whatever I may ask you, however unreasonable it may appear to you to be.”

“That is a good deal to ask,” said I.

“Unfortunately I cannot put it more plainly, for I do not myself know what turn matters may take. You may be sure, however, that you will not be asked to do anything which your conscience does not approve; and I promise you that, when all is over, you will be proud to have been concerned in so good a work.”

“If it ends happily,” said the lady.

“Exactly; if it ends happily,” his lordship repeated.

“And terms?” I asked.

“Twenty pounds a day.”

I was amazed at the sum, and must have showed my surprise upon my features.

“It is a rare combination of qualities, as must have struck you when you first read the advertisement,” said Lord Linchmere; “such varied gifts may well command a high return, and I do not conceal from you that your duties might be arduous or even dangerous. Besides, it is possible that one or two days may bring the matter to an end.”

“Please God!” sighed his sister.

“So now, Dr. Hamilton, may I rely upon your aid?”

“Most undoubtedly,” said I. “You have only to tell me what my duties are.”

“Your first duty will be to return to your home. You will pack up whatever you may need for a short visit to the country. We start together from Paddington Station at 3:40 this afternoon.”

“Do we go far?”

“As far as Pangbourne. Meet me at the bookstall at 3:30. I shall have the tickets. Good-bye, Dr.