with his key, having first kicked off his shoes, an example which I followed. We crept together through room after room, until the large hall lay before us, with that dark figure still stooping and working at the central case. With an advance as cautious as his own we closed in upon him, but softly as we went we could not take him entirely unawares. We were still a dozen yards from him when he looked round with a start, and uttering a husky cry of terror, ran frantically down the museum.

"Simpson! Simpson!" roared Mortimer, and far away down the vista of electric-lighted doors we saw the stiff figure of the old soldier suddenly appear. Professor Andreas saw him also, and stopped running, with a gesture of despair. At the same instant we each laid a hand upon his shoulder.

"Yes, yes, gentlemen," he panted, "I will come with you. To your room, Mr. Ward Mortimer, if you please! I feel that I owe you an explanation."

My companion's indignation was so great that I could see that he dared not trust himself to reply. We walked on each side of the old Professor, the astonished commissionaire bringing up the rear. When we reached the violated case, Mortimer stopped and examined the breast-plate. Already one of the stones of the lower row had had its setting turned back in the same manner as the others. My friend held it up and glanced furiously at his prisoner.

"How could you!" he cried. "How could you!"

"It is horrible—horrible!" said the Professor. "I don't wonder at your feelings. Take me to your room."

"But this shall not be left exposed!" cried Mortimer. He picked the breast-plate up and carried it tenderly in his hand, while I walked beside the Professor, like a policeman with a malefactor. We passed into Mortimer's chambers, leaving the amazed old soldier to understand matters as best he could. The Professor sat down in Mortimer's arm-chair, and turned so ghastly a colour that, for the instant, all our resentment was changed to concern. A stiff glass of brandy brought the life back to him once more.

"There, I am better now!" said he. "These last few days have been too much for me. I am convinced that I could not stand it any longer. It is a nightmare—a horrible nightmare—that I should be arrested as a burglar in what has been for so long my own museum. And yet I cannot blame you. You could not have done otherwise. My hope always was that I should get it all over before I was detected. This would have been my last night's work."

"How did you get in?" asked Mortimer.

"By taking a very great liberty with your private door. But the object justified it. The object justified everything. You will not be angry when you know everything—at least, you will not be angry with me. I had a key to your side door and also to the museum door. I did not give them up when I left. And so you see it was not difficult for me to let myself into the museum. I used to come in early before the crowd had cleared from the street. Then I hid myself in the mummy-case, and took refuge there whenever Simpson came round. I could always hear him coming. I used to leave in the same way as I came."

"You ran a risk."

"I had to."

"But why? What on earth was your object—you to do a thing like that!" Mortimer pointed reproachfully at the plate which lay before him on the table.

"I could devise no other means. I thought and thought, but there was no alternative except a hideous public scandal, and a private sorrow which would have clouded our lives. I acted for the best, incredible as it may seem to you, and I only ask your attention to enable me to prove it."

"I will hear what you have to say before I take any further steps," said Mortimer, grimly.

"I am determined to hold back nothing, and to take you both completely into my confidence. I will leave it to your own generosity how far you will use the facts with which I supply you."

"We have the essential facts already."

"And yet you understand nothing. Let me go back to what passed a few weeks ago, and I will make it all clear to you. Believe me that what I say is the absolute and exact truth.

"You have met the person who calls himself Captain Wilson. I say 'calls himself' because I have reason now to believe that it is not his correct name. It would take me too long if I were to describe all the means by which he obtained an introduction to me and ingratiated himself into my friendship and the affection of my daughter. He brought letters from foreign colleagues which compelled me to show him some attention. And then, by his own attainments, which are considerable, he succeeded in making himself a very welcome visitor at my rooms. When I learned that my daughter's affections had been gained by him, I may have thought it premature, but I certainly was not surprised, for he had a charm of manner and of conversation which would have made him conspicuous in any society.

"He was much interested in Oriental antiquities, and his knowledge of the subject justified his interest. Often when he spent the evening with us he would ask permission to go down into the museum and have an opportunity of privately inspecting the various specimens. You can imagine that I, as an enthusiast, was in sympathy with such a request, and that I felt no surprise at the constancy of his visits. After his actual engagement to Elise, there was hardly an evening which he did not pass with us, an hour or two were generally devoted to the museum. He had the free run of the place, and when I have been away for the evening I had no objection to his doing whatever he wished here. This state of things was only terminated by the fact of my resignation of my official duties and my retirement to Norwood where I hoped to have the leisure to write a considerable work which I had planned.

"It was immediately after this—within a week or so—that I first realized the true nature and character of the man whom I had so imprudently introduced into my family. The discovery came to me through letters from my friends abroad, which showed me that his introductions to me had been forgeries. Aghast at the revelation, I asked myself what motive this man could originally have had in practising this elaborate deception upon me. I was too poor a man for any fortune-hunter to have marked me down. Why, then, had he come? I remembered that some of the most precious gems in Europe had been under my charge, and I remembered also the ingenious excuses by which this man had made himself familiar with the cases in which they were kept. He was a rascal who was planning some gigantic robbery. How could I, without striking my own daughter, who was infatuated about him, prevent him from carrying out any plan which he might have formed? My device was a clumsy one, and yet I could think of nothing more effective. If I had written a letter under my own name, you would naturally have turned to me for details which I did not wish to give. I resorted to an anonymous letter begging you to be upon your guard.

"I may tell you that my change from Belmore Street to Norwood had not affected the visits of this man, who had, I believe, a real and overpowering affection for my daughter. As to her, I could not have believed that any woman could be so completely under the influence of a man as she was. His stronger nature seemed to entirely dominate her. I had not realized how far this was the case, or the extent of the confidence which existed between them, until that very evening when his true character for the first time was made clear to me. I had given orders that when he called he should be shown into my study instead of to the drawing-room. There