A noise made him start, made him guiltily turn. He crammed up his thieveries into the suit-case and shut the lid; then listened again, looked. Not a sign of life, not a sound. And yet he had certainly heard something-something like a sigh, something like the creak of a board. He tiptoed to the door and, cautiously opening it, found himself looking on to a broad landing. On the opposite side of the landing was another door, ajar. He stepped out, pushed, peeped.