“I am ready,” she said.

“Bravo!” whispered the professor. “Now, silence, for we have to pass the guards.”

“But where are we going?” said Chumley.

“Chumley! Oh, that tongue!” whispered his wife.

“Silence!” said Yussuf decidedly; and then after a pause, “Ready?”

There was no reply, and taking this for consent, he bade the professor come last, after holding the rugs aside till all had passed, and then he stepped out, and stepped back again, for a piercingly cold breath of air had darted into the prison.

“It is snowing,” he said in a low whisper.

“Well?” said Mr Burne, “we are going down from the mountain, and we shall leave it behind, shall we not?”

“Yes, perhaps,” said the guide, in a doubting manner. “Shall we risk it?”

“Yes, certainly,” said Mr Preston. “We must go now.”