He was on the point of throwing up the window when a man's face shot up from underneath and peered into the room.

There was only the thickness of the glass between them, and the light from the gas lamp which stood at the corner of the drive fell full upon the white, strained features and the glittering black eyes which stared into the room.

The chink of the curtain through which Arnold was gazing was barely an inch wide; but it was sufficient.

For a moment he stared at the man.

Then he threw the curtains open and stooped to unfasten the window.