“And why?”

“Quite so. Why? When we answer that we have made some progress with our little problem. Why? There can be only one adequate reason. Someone wanted to learn to imitate your writing, and had to procure a specimen of it first. And now if we pass on to the second point we find that each throws light upon the other. That point is the request made by Pinner that you should not resign your place, but should leave the manager of this important business in the full expectation that a Mr. Hall Pycroft, whom he had never seen, was about to enter the office upon the Monday morning.”

“My God!” cried our client, “what a blind beetle I have been!”