“We plodded on steadily till we heard the half-past nine letters dropped into the box. Then it occurred to us we had better turn down the lights and give our office as deserted a look as we could. It was rather slow work sitting in the dark for a couple of hours, not speaking a word or daring to move a toe. The fire got low, but we dared not make it up; and of course we both had awful desires to sneeze and cough—you always do at such times—and half killed ourselves in our efforts to smother them. We could hear the cabs and omnibuses in Fleet Street keeping up a regular roar; but no footsteps came near us, except once when a telegraph boy (as we guessed by his shrill whistling and his smart step) came and dropped a telegram into the box. I assure you the click the flap of the letter-box made that moment, although I knew what it was and why it was, made my heart beat like a steam-engine.
“It was beginning to get rather slow when twelve came and still nothing to disturb us. We might have been forging ahead with our writing all this time if we had only known.
“Presently Waterford whispered,—
“‘They won’t try to-night now.’
“Just as he spoke we heard a creak on the stairs outside. We had heard lots of creaks already, but somehow this one startled us both. I instinctively picked up the ruler from the table, and Waterford took my arm and motioned me close to the wall beside him. Another creak came presently and then another. Evidently some one was coming down the stairs cautiously, and in the dark too, for we saw no glimmer of a light through the partly-opened door. We were behind it, so that if it opened we should be quite hidden unless the fellow groped round it.
“Down he came slowly, and there was no mistake now about its being a human being and not a ghost, for we heard him clearing his throat very quietly and snuffling as he reached the bottom step. I can tell you it was rather exciting, even for a fellow of my dull nerves.
“Waterford nudged me to creep a little nearer the gas, ready to turn it up at a moment’s notice, while he kept at the door, to prevent our man getting out after he was once in.
“Presently the door opened very quietly. He did not fling it wide open, luckily, or he was bound to spot us behind it; but he opened it just enough to squeeze in, and then, feeling his way round by the wall, made straight for the letter-box. Although it was dark he seemed to know his way pretty well, and in a few seconds we heard him stop and fumble with a key in the lock. In a second or two he had opened it, and then, crouching down, began cautiously to rub a match on the floor. The light was too dim to see anything but the crouching figure of a man bending over the box and examining the addresses of one or two of the letters in it. His match went out before he had found what he wanted.
“It was hard work to keep from giving him a little unexpected light, for my fingers itched to turn up the gas. However, it was evidently better to wait a little longer and see what he really was up to before we were down on him.
“He lit another match, and this time seemed to find what he wanted, for we saw him put one letter in his pocket and drop all the others back into the box, blowing out his match as he did so.