If only--" She broke off, with a catch in her sweet voice.

And, scarce realizing what she did, she put the silver whistle to her lips and blew a piercingly loud blast.
"What's that for ?" asked the Master, crankily, worry over his beloved dog making his nerves raw.

"If Lad's alive, he's fastened there.

You say you saw him struggling to get loose, this morning.

He can't come, when he hears that whistle.