At last he found it, situated at the back of one of the shelves, and set above a row of four small books, so that it could readily be reached by inserting the hand.
He flooded the place with light; and perceived at a glance that a length of white flex crossing the ceiling enabled anyone seated at the table to ignite the lamp from there also. Then, replacing his torch in his pocket, and assuring himself that the iron bar lay within easy reach, he began deliberately to remove all of the books from the shelves covering that side of the room upon which the switch was situated. His theory was a sound one; he argued that the natural and proper place for such a switch in such a room would be immediately inside the door, so that one entering could ignite the lamp without having to grope in the darkness. He was encouraged, furthermore, by the fact that at a point some four feet to the left of this switch there was a gap in the bookcases, running from floor to ceiling; a gap no more than four inches across.
Having removed every book from its position, save three, which occupied a shelf on a level with his shoulder and adjoining the gap, he desisted wearily, for many of the volumes were weighty, and the heat of the room was almost insufferable. He dropped with a sigh upon a silk ottoman close beside him.…
A short, staccato, muffled report split the heavy silence…and a little round hole appeared in the
