My visitor was silent for a few moments after he had taken the chair I had offered. His dark eyes were fixed upon me with a strange, intense look, until, with some hesitation, he at last said:

“I believe, Mr Holford, you are agent for a new German tyre—the Eckhardt it is called, is it not?”

“I am,” I replied. “I am sole agent in London.”

“Well, I want to examine one,” he exclaimed, “but in strict confidence. Other persons will probably come to you and beg to see this particular tyre, but I wish you to regard the fact that I have seen it as entirely between ourselves. Will you do so? A very serious issue depends upon your discretion—how serious you will one day realise.”

I looked at him in surprise. His request for secrecy struck me as distinctly peculiar.

“Well, of course, if you wish,” I replied, “I’ll regard the fact that you have seen the Eckhardt non-skid as confidential. Is it in connection with any new invention?” I asked suspiciously.

“Not at all,” he laughed. “I have nothing whatever to do with motor-cars or the motor trade. I merely wish to satisfy myself by looking at one of the new tyres.”

So I went upstairs, and brought down one of the German covers for his inspection.

He took it in his hands, and, very careful that Dick should not observe him from the outside, closely examined the triangular steel studs with which the cover was fitted.

From his pocket he took a piece of paper, and, folding it, measured the width of the tyre, making a break in the edge of the folded paper. Then he felt the edges of the studs, and began to ask questions regarding the life of the new tyre.