“Seats, gentlemen, seats,” roared the voice. “We are moving immediately.”

Then the crowd melted as the conductor came through, red-faced and determined, and Percy, springing into his wake, found his way clear to the stern.

The Cardinal seemed none the worse. He had been asleep, he explained, and saved himself in time from rolling on to the floor; but his old face twitched as he talked.

“But what is it?” he said. “What is the meaning?”

Father Bechlin related how he had actually seen one of the troop of volors within five yards of the window; it was crowded with faces, he said, from stem to stern. Then it had soared suddenly, and vanished in whorls of mist.

Percy shook his head, saying nothing. He had no explanation.

“They are inquiring, I understand,” said Father Bechlin again. “The conductor was at his instrument just now.”

There was nothing to be seen from the windows now. Only, as Percy stared out, still dazed with the shock, he saw the cruel needle of rock wavering beneath as if seen through water, and the huge shoulder of snow swaying softly up and down. It was quieter outside. It appeared that the flock had passed, only somewhere from an infinite height still sounded a fitful wailing, as if a lonely bird were wandering, lost in space.

“That is the signalling volor,” murmured Percy to himself.

He had no theory—no suggestion. Yet the matter seemed an ominous one. It was unheard of that an encounter with a hundred volors should take place, and he wondered why they were going southwards. Again the name of Felsenburgh came to his mind. What if that sinister man were still somewhere overhead?