“I hope, Mr Holford,” he said, turning to me, “I hope that I’ve now convinced you that I’m no impostor, and that I am actually Professor Ernest Greer in the flesh.”

“You have,” I admitted; “there are, however, several points which are not yet clear to me.”

“My good friend Kirk, here, will make them clear, I’m sure,” he said. “The only service I beg of you is that of complete and absolute silence. It was the German’s life or mine. He attacked me murderously with a knife, and what I did was—God knows!—only in self-defence. Yet—yet the public must know nothing. It is for fear of you, that you might learn the truth and expose the affair to the Press, that I have lived in perpetual anxiety, travelling constantly from place to place, in the hope that you would still regard me as the impostor. While you believed that, I had nothing to fear. My daughter has, indeed, threatened to commit suicide if the public are told that I killed the man who tried to steal my secret. To her, your silence means love and life!”

“Yes, Mr Holford,” declared the girl anxiously; “Leonard does not know the truth. If he did, he would surely discard me as the daughter of a murderer. Indeed, I could never again hold up my head. I believe implicitly in my dear father’s version of the affair—yet his enemies surely would not! Will you, at least, give me your promise?” she implored.

I hesitated. I was not altogether clear upon many points.

“When I have seen my wife and consulted with her I will give you an answer, Miss Greer,” I said. “I admit that what I have learnt to-day has held me in surprise and removed many doubts from my mind.”

Kirk was explaining how the tiny golden doll, the little charm which had been discovered after the tragedy, had been traced through the well-known jeweller in Bond Street who made it, to the Professor as purchaser; and how Greer had admitted buying it for the purpose of giving to Ethelwynn to hang upon her bracelet. But he had lost it on the previous day. Therefore it was not a clue to the assassin, as we had at first suspected.

Just then the grave-eyed Antonio reopened the door, bowing, and announcing to his master that the motor-cab was at the door.

Thereupon Professor Greer shook my hand, with a parting appeal to me to preserve silence.

“You will, no doubt, meet your wife ere long, and she will explain much which is to you still a mystery. Remember that her devotion to you was the cause of her absence. She believed that you were in danger. That story was told her to keep her away from you, and thus draw you off the inquiry in which we feared you might be only too successful. Adieu, Mr Holford! When I return, in a week’s time, I hope you will come and have a further chat with me. In the meantime, I can only beg you to forgive me for being the unwilling means of causing you either horror, annoyance, or anxiety.”