The rest were instantly still.

Hal Purvis leaned his weazened face towards the ground.

In this manner it was sometimes possible to detect far-off sounds which to one erect would be inaudible.

In a moment, however, he straightened up, shaking his head.
"What is it ?" whispered Haines.
"Shut up," muttered Silent, and the words were formed by the motion of his lips rather than through any sound.

"That damned whistling again." Every face changed.