He appeared to be watching me intently and anxiously, for as I opened my eyes and looked about me he gave a great cry of relief. "Thank God!" he cried. "Thank God!"

"Where is he?" I asked, looking round the room. As I did so, I became aware that the furniture was scattered in every direction, and that there were traces of an even more violent struggle than that in which I had been engaged.

The Doctor sank his face between his hands.

"They have him," he groaned. "After these years of trial they have him again. But how thankful I am that he has not for a second time stained his hands in blood."

As the Doctor spoke I became aware that a man in the braided jacket of an inspector of police was standing in the doorway.

"Yes, sir," he remarked, "you have had a pretty narrow escape. If we had not got in when we did, you would not be here to tell the tale. I don't know that I ever saw any one much nearer to the undertaker."

I sat up with my hands to my throbbing head.

"Dr. McCarthy," said I, "this is all a mystery to me. I should be glad if you could explain to me who this man is, and why you have tolerated him so long in your house."

"I owe you an explanation, Mr. Weld--and the more so since you have, in so chivalrous a fashion, almost sacrificed your life in my defence. There is no reason now for secrecy. In a word, Mr. Weld, this unhappy man's real name is James McCarthy, and he is my only son."

"Your son?"

"Alas, yes. What sin have I ever committed that I should have such a punishment? He has made my whole life a misery from the first years of his boyhood. Violent, headstrong, selfish, unprincipled, he has always been the same. At eighteen he was a criminal. At twenty, in a paroxysm of passion, he took the life of a boon companion and was tried for murder. He only just escaped the gallows, and he was condemned to penal servitude. Three years ago he succeeded in escaping, and managed, in face of a thousand obstacles, to reach my house in London. My wife's heart had been broken by his condemnation, and as he had succeeded in getting a suit of ordinary clothes, there was no one here to recognise him. For months he lay concealed in the attics until the first search of the police should be over. Then I gave him employment here, as you have seen, though by his rough and overbearing manners he made my own life miserable, and that of his fellow-masters unbearable. You have been with us for four months, Mr. Weld, but no other master endured him so long. I apologise now for all you have had to submit to, but I ask you what else could I do? For his dead mother's sake I could not let harm come to him as long as it was in my power to fend it off. Only under my roof could he find a refuge--the only spot in all the world--and how could I keep him here without it exciting remark unless I gave him some occupation? I made him English master therefore, and in that capacity I have protected him here for three years. You have no doubt observed that he never during the daytime went beyond the college grounds. You now understand the reason. But when to-night you came to me with your report of a man who was looking through his window, I understood that his retreat was at last discovered.