"Well," Hewitt replied, "it all comes to the simple first statement. You know that nobody left the place or arrived, except the postman, who couldn't get near the drawings, and yet the drawings went. Is this your office?" The cab had stopped before a large stone building. Mr. Dixon alighted and led the way to the first-floor. Hewitt took a casual glance round each of the three rooms. There was a sort of door in the frame of ground glass over the barrier to admit of speech with visitors. This door Hewitt pushed wide open, and left so. He and the engineer went into the inner office. "Would you like to ask Worsfold and Ritter any questions?" Mr. Dixon inquired. "Presently. Those are their coats, I take it, hanging just to the right of the outer office door, over the umbrella stand?" "Yes, those are all their things--coats, hats, stick, and umbrella." "And those coats were searched, you say?" "Yes." "And this is the drawer--thoroughly searched, of course?" "Oh, certainly; every drawer was taken out and turned over." "Well, of course I must assume you made no mistake in your hunt. Now tell me, did anybody know where these plans were, beyond yourself and your two men?" "As far as I can tell, not a soul." "You don't keep an office boy?" "No. There would be nothing for him to do except to post a letter now and again, which Ritter does quite well for." "As you are quite sure that the drawings were there at ten o'clock, perhaps the thing scarcely matters. But I may as well know if your men have keys of the office?" "Neither. I have patent locks to each door and I keep all the keys myself. If Worsfold or Ritter arrive before me in the morning they have to wait to be let in; and I am always present myself when the rooms are cleaned. I have not neglected precautions, you see." "No. I suppose the object of the theft--assuming it is a theft--is pretty plain: the thief would offer the drawings for sale to some foreign government?" "Of course. They would probably command a great sum. I have been looking, as I need hardly tell you, to that invention to secure me a very large fortune, and I shall be ruined, indeed, if the design is taken abroad. I am under the strictest engagements to secrecy with the Admiralty, and not only should I lose all my labor, but I should lose all the confidence reposed in me at headquarters; should, in fact, be subject to penalties for breach of contract, and my career stopped forever. I can not tell you what a serious business this is for me. If you can not help me, the consequences will be terrible. Bad for the service of the country, too, of course." "Of course. Now tell me this: It would, I take it, be necessary for the thief to _exhibit_ these drawings to anybody anxious to buy the secret--I mean, he couldn't describe the invention by word of mouth."