Slowly they walked along the empty streets of the town; a bright autumn moon silvered the roofs, casting deep shadows; there was no breath of wind; and the trees in the formal gardens by the sea-front watched them silently as they passed along. To his aunt's occasional remarks Shorthouse made no reply, realising that she was simply surrounding herself with mental buffers--saying ordinary things to prevent herself thinking of extra-ordinary things. Few windows showed lights, and from scarcely a single chimney came smoke or sparks. Shorthouse had already begun to notice everything, even the smallest details. Presently they stopped at the street corner and looked up at the name on the side of the house full in the moonlight, and with one accord, but without remark, turned into the square and crossed over to the side of it that lay in shadow. "The number of the house is thirteen," whispered a voice at his side; and neither of them made the obvious reference, but passed across the broad sheet of moonlight and began to march up the pavement in silence. It was about half-way up the square that Shorthouse felt an arm slipped quietly but significantly into his own, and knew then that their adventure had begun in earnest, and that his companion was already yielding imperceptibly to the influences against them. She needed support. A few minutes later they stopped before a tall, narrow house that rose before them into the night, ugly in shape and painted a dingy white. Shutterless windows, without blinds, stared down upon them, shining here and there in the moonlight. There were weather streaks in the wall and cracks in the paint, and the balcony bulged out from the first floor a little unnaturally. But, beyond this generally forlorn appearance of an unoccupied house, there was nothing at first sight to single out this particular mansion for the evil character it had most certainly acquired. Taking a look over their shoulders to make sure they had not been followed, they went boldly up the steps and stood against the huge black door that fronted them forbiddingly. But the first wave of nervousness was now upon them, and Shorthouse fumbled a long time with the key before he could fit it into the lock at all. For a moment, if truth were told, they both hoped it would not open, for they were a prey to various unpleasant emotions as they stood there on the threshold of their ghostly adventure. Shorthouse, shuffling with the key and hampered by the steady weight on his arm, certainly felt the solemnity of the moment. It was as if the whole world--for all experience seemed at that instant concentrated in his own consciousness--were listening to the grating noise of that key. A stray puff of wind wandering down the empty street woke a momentary rustling in the trees behind them, but otherwise this rattling of the key was the only sound audible; and at last it turned in the lock and the heavy door swung open and revealed a yawning gulf of darkness beyond.