"Yes. Tatra—that is it. They spoke of it for half an hour. Eh—Zaidee?"

"Yes. It is the name."

Renwick paced the floor with long steps.

"Selim," he said at last, "it is now dark. I must go at once."

"Tomorrow."

"Tonight. The stars are out."

He moved to the door and peered out.

"You will keep silent?" he asked.

"Have I not promised?" said Selim.

He caught them both by the hand.