“I say!” he said in faultless English as he entered. He had a beaming face, and a sort of pinkish blond hair. “Fancy you being Butteridge.” He slapped Bert's meagre luggage down.

“We'd have started,” he said, “in another half-hour! You didn't give yourself much time!”

He surveyed Bert curiously. His gaze rested for a fraction of a moment on the sandals. “You ought to have come on your flying-machine, Mr. Butteridge.”

He didn't wait for an answer. “The Prince says I've got to look after you. Naturally he can't see you now, but he thinks your coming's providential. Last grace of Heaven. Like a sign. Hullo!”

He stood still and listened.

Outside there was a going to and fro of feet, a sound of distant bugles suddenly taken up and echoed close at hand, men called out in loud tones short, sharp, seemingly vital things, and were answered distantly. A bell jangled, and feet went down the corridor. Then came a stillness more distracting than sound, and then a great gurgling and rushing and splashing of water. The young man's eyebrows lifted. He hesitated, and dashed out of the room. Presently came a stupendous bang to vary the noises without, then a distant cheering. The young man re-appeared.

“They're running the water out of the ballonette already.”

“What water?” asked Bert.

“The water that anchored us. Artful dodge. Eh?”

Bert tried to take it in.