He brought a couple of letters during the morning. I mean
that absolutely nobody came past the barrier in the outer office--the
usual thing, you know, like a counter, with a frame of ground glass over
it."
"I quite understand that. But I think you said that the drawings were in a
drawer in your _own_ room--not the outer office, where the draughtsmen
are, I presume?"
"That is the case. It is an inner room, or, rather, a room parallel with
the other, and communicating with it; just as your own room is, which we
have just left."
"But, then, you say you never left your office, and yet the drawings
vanished--apparently by some unseen agency--while you were there in the
room?"
"Let me explain more clearly." The cab was bowling smoothly along the
Strand, and the engineer took out a pocket-book and pencil. "I fear," he
proceeded, "that I am a little confused in my explanation--I am naturally
rather agitated. As you will see presently, my offices consist of three
rooms, two at one side of a corridor, and the other opposite--thus." He
made a rapid pencil sketch.
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