“But where is Mabel?” she cried in alarm. “The Professor and the others have returned from abroad, yet she is still absent. Will they accord you no satisfaction?”

“None!” I replied with a weary sigh. “I don’t know, after all, whether to accept what has been related to me, or whether to disbelieve it.”

“The fact that the police refused to inquire into your story, Harry, seems sufficient proof that this man Kirk is a powerful and influential person. Indeed, does it not tend to confirm the story that the Professor did not die, and that he really killed the German in self-defence?”

I admitted that it did. And then I made up my mind that, as Kirk would give me no satisfaction concerning Mabel, I, on my part, would decline to enter into any bond of secrecy.

My wife was worth far more to me than any international complication. What was Germany’s wrath at being foiled in her dastardly attempt to obtain the secret of the new steel, to Mabel’s honour and her love?

Two lagging days had gone by.

Kershaw Kirk had called in the evening about seven o’clock, but I refused to see him. I sent word by Annie that I was out driving a car.

“Tell Mr Holford to come in and see me the instant he returns. I must speak to him at the earliest possible moment,” he had said. And this was the message which the maid had brought to me when the astute official of the British Government had left.

Just before ten I entered Kirk’s close little den. He was seated in his bead slippers and old velvet coat, while behind him stood the grey parrot, which screeched loudly as Miss Kirk opened the door to admit me.

Seated opposite him, near the fire, was Leonard Langton, pale-faced and grave.