They were long and thick." "I can see, by the position of the screw-holes, that they were long; but how do you arrive at their thickness ?" "By the size of the counter-holes in the jamb of the door.

These holes have been very carefully filled with wooden plugs covered with knotting; but you can make out their diameter, which is that of the bolts, and which is decidedly out of proportion for an ordinary bedroom door.

Let me show you a light." He flashed his lamp into the dark corner, and I was able to see distinctly the portentously large holes into which the bolts had fitted, and also to note the remarkable neatness with which they had been plugged.
"There was a second door, I remember," said I."Let us see if that was guarded in a similar manner." We strode through the empty room, awakening dismal echoes as we trod the bare boards, and flung open the other door.

At top and bottom, similar groups of screw-holes showed that this also had been made secure, and that these bolts had been of the same very substantial character as the others.
Thorndyke turned away from the door with a slight frown.
"If we had any doubts," said he, "as to what has been going on in this house, these traces of massive fastenings would be almost enough to settle them." "They might have been there before Weiss came," I suggested.

"He only came about seven months ago and there is no date on the screw-holes." "That is quite true.