He dropped back on to the gravel path and listened. The wind soughed sadly in the bare tree-tops, somewhere in the distance a dog barked hoarsely, insistently; otherwise not a sound was to be heard. He cast a cautious glance round the side of the house. The glass door was shut; the lamp in the corridor had not been lit.

Hoisting himself up to the window-sill again, he crooked one knee on the rough edge and thrusting one arm through the broken pane of glass, unbolted the window. Then, steadying himself with one hand, with the other he very gently pushed up the window, threw his legs across the sill, and dropped into the library. Very deliberately, he turned and pushed the window softly down behind him.

Some unconscious prompting, perhaps an unfamiliar surface beneath his feet, made him look down. Where his feet rested on the mole-grey carpet a wide dark patch stood out from the delicate shade of the rug. For a moment a spasm of physical nausea caught him.

“How beastly!” he whispered to himself and took a step towards the desk.

Hartley Parrish’s desk was arranged just as he always remembered it to have been. All the letter-trays save one were empty. In that was a little pile of papers held down by a massive marble paper-weight. Quickly he stepped round the desk.

He had put out his hand to lift the weight when there was a gentle rattle at the door.

Bruce Wright wheeled instantly round, back to the desk, to face the door, which, in the gathering dusk, was now but a squarer patch of darkness among the shadows at the far end of the library. He stood absolutely still, rooted to the spot, his heart thumping so fast that, in that silent room, he could hear the rapid beats.

Some one was unlocking the library door. As realization came to the boy, he tiptoed rapidly round the desk, the sound of his feet muffled by the heavy pile carpet, and reached the window. There was a click as the lock of the door was shot back. Without further hesitation Bruce stepped behind the long curtains which fell from the top of the window to the floor.

The curtains, of some heavy grey material, were quite opaque. Bruce realized, with a sinking heart, that he must depend on his ears to discover the identity of this mysterious interloper. He dared not look out from his hiding-place—at least not until he could be sure that the newcomer had his back to the window. He remained, rigid and vigilant, straining his ears to catch the slightest sound, scarcely daring to breathe.

He heard the door open, heard it softly close again. Then ... silence. Not another sound. The boy remembered the heavy pile carpet and cursed his luck. He would have to risk a peep round the curtains. But not yet! He must wait ...