Nothing!
“Looks all right,” he murmured to himself. “And yet—”
He remained for a minute lost in thought. Then he stepped back into the library. Crossing to the door, he locked it and put the key in his pocket. Then he switched off the light. He stood for a minute listening, then crossed softly to the open window and stood there, Leopold ready in his hand.
Was there, or was there not, a soft patter of feet along the terrace? No—his imagination. He grasped Leopold tightly and stood listening …
In the distance a stable clock chimed two.