At first everything about him was silent, but soon he became aware of movements going on in the house itself. Rustlings and cheepings came to him across that still, moonlit yard. A concourse of living beings sent the hum of their activity into the night. Things were on the move everywhere. A biting, pungent odour rose through the air, coming he knew not whence. Presently his eyes became glued to the windows of the opposite wall where the moonshine fell in a soft blaze. The roof overhead, and behind him, was reflected clearly in the panes of glass, and he saw the outlines of dark bodies moving with long footsteps over the tiles and along the coping. They passed swiftly and silently, shaped like immense cats, in an endless procession across the pictured glass, and then appeared to leap down to a lower level where he lost sight of them. He just caught the soft thudding of their leaps. Sometimes their shadows fell upon the white wall opposite, and then he could not make out whether they were the shadows of human beings or of cats. They seemed to change swiftly from one to the other. The transformation looked horribly real, for they leaped like human beings, yet changed swiftly in the air immediately afterwards, and dropped like animals.