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"Good," said Gordon. "I'll step the rooms, shall I, while you step the passage? We hardly need the tape-measure yet."
"Better do both, if you won't mind; then the pace will be the same." And Carmichael busied himself in wandering round the room looking for cracks till Gordon reappeared. "Well," he said, "what news?"
"The fireplace wall, I fancy," said Gordon. "From the door of Colonel Steele's room to the door of this, walking down the passage, it takes twelve strides. Inside his room, I only take five strides to the wall. Inside this room, I take a bit over five strides to the same wall. Therefore there must be a thickness of about a pace and a half between Colonel Steele's room and Reeves'. Now one comes to think of it, he wouldn't hear Murdock's cello if there was that thickness the other side."
"A pace and a half? The priests must have been on the thin side. Yes, that would be it: there must be a length of about ten feet from the fireplace to the wall on the side of the fireplace opposite to the