Walter Hine, however, heard Sylvia's cry, faint though it was. He leaned forward from the window and peered down. "Now!" said Sylvia. "Now!" But Chayne did not answer. He was watching with an extraordinary suspense. He seemed not to hear. And on the ceiling the shadow moved, and changed its shape, now dwindling, now growing larger again, now disappearing altogether as though the intruder stooped below the level of the lamp; and once there was flung on the white plaster the huge image of an arm which had something in its hand. Was the arm poised above the lamp, on the point of smashing it with the thing it held? Chayne waited, with a cry upon his lips, expecting each moment that the room would be plunged in darkness. But the cry was not uttered, the arm was withdrawn. It had not been raised to smash the lamp, the thing which the hand held was for some other purpose. And once more the shadow appeared moving and changing as the intruder crept nearer to the window. Sylvia stood motionless. She had thought to cry out, now she was fascinated. A spell of terror constrained her to silence. And then, suddenly, behind Walter Hine there stood out clearly in the light the head and shoulders of Garratt Skinner. "My father," said Sylvia, in relief. Her clasp upon Chayne's arm relaxed; her terror passed from her. In the revulsion of her feelings she laughed quietly at her past fear. Chayne looked quickly and curiously at her. Then as quickly he looked again to the window. Both men in the room were now lit up by the yellow light; their attitudes, their figures were very clear but small, like marionettes upon the stage of some tiny theater. Chayne watched them with no less suspense now that he knew who the intruder was. Unlike Sylvia he had betrayed no surprise when he had seen Garratt Skinner's head and shoulders rise into view behind Walter Hine; and unlike Sylvia, he did not relax his vigilance. Suddenly Garratt Skinner stepped forward, very quickly, very silently. With one step he was close behind his friend; and then just as he was about to move again--it seemed to Sylvia that he was raising his arm, perhaps to touch his friend upon the shoulder--Chayne whistled--whistled sharply, shrilly and with a kind of urgency which Sylvia did not understand. Walter Hine leaned forward out of the window. That was quite natural. But on the other hand Garratt Skinner did nothing of the kind. To Sylvia's surprise he stepped back, and almost out of sight. Very likely he thought that he was out of sight. But to the watchers in the road his head was just visible. He was peering over Walter Hine's shoulder. Again Chayne whistled and, not content with whistling, he cried out in a feigned bucolic accent: "I see you." At once Garratt Skinner's head disappeared altogether.