"Hewitt produced the stick" brought back!" the engineer exclaimed. "I see that, clearly. But how did they get away? That's as mysterious as ever."
"Not a bit of it. See here. Mirsky gets hold of Ritter, and they agree to get your drawings and photograph them. Ritter is to let his confederate have the drawings, and Mirsky is to bring them back as soon as possible, so that they shan't be missed for a moment. Ritter habitually carries this Malacca cane, and the cunning of Mirsky at once suggests that this tube should be made in outward facsimile. This morning, Mirsky keeps the actual stick and Ritter comes to the office with the tube. He seizes the first opportunity—probably when you were in this private room, and Worsfold was talking to you from the corridor—to get at the tracings, roll them up tightly, and put them in the tube, putting the tube back into the umbrella stand. At half-past twelve, or whenever it was, Mirsky turns up for the first time with the actual stick and exchanges them, just as he afterwards did when he brought the drawings back."
"Yes, but Mirsky came half an hour after they were—oh, yes, I see. What a fool I was! I was forgetting. Of course, when I first missed the tracings they were in this walking-stick, safe enough, and I was tearing my hair out within arm's reach of them!"
"Precisely. And Mirsky took them away before your very eyes. I expect Ritter was in a rare funk when he found that the drawings were missed. He calculated, no doubt, on your not wanting them for the hour or two they would be out of the office."
"How lucky that it struck me to jot a pencil-note on one of them! I might easily have made my note somewhere else, and then I should never have known that they had been away."
"Yes, they didn't give you any too much time to miss them. Well, I think the rest's pretty clear. I brought the tracings in here, screwed up the sham stick and put it back. You identified the tracings and found none missing, and then my course was pretty clear, though it looked difficult. I knew you would be very naturally indignant with Ritter, so, as I wanted to manage him myself, I told you nothing of what he had actually done, for fear that, in your agitated state, you might burst out with something that would spoil my game. To Ritter I pretended to know nothing of the return of the drawings or how they had been stolen—the only things I did know with certainty. But I did pretend to know all about Mirsky—or Hunter—when, as a matter of fact, I knew nothing at all, except that he probably went under more than one name. That put Ritter into my
