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Rh some mystic pass-word, the omission of which would prove him an impostor at once. At length he took a pen and wrote rapidly; he would have to chance it.

"Urgent. A message from headquarters."

He sealed the envelope and handed it with the necessary five shillings for postage to the man. Then he sat down to wait. It was going to be a ticklish interview if he was to learn anything, but the thrill of the game had fairly got him by now, and he watched eagerly for the messenger's return. After what seemed an interminable delay he saw him crossing the lounge.

"Mr. Potts will see you, sir. Will you come this way?"

"Is he alone?" said Hugh, as they were whirled up in the lift.

"Yes, sir. I think he was expecting you."

"Indeed," murmured Hugh. "How nice it is to have one's expectations realised."

He followed his guide along a corridor, and paused outside a door while he went into a room. He heard a murmur of voices, and then the man reappeared.

"This way, sir," he said, and Hugh stepped inside, to stop with an involuntary gasp of surprise. The man seated in the chair was Potts, to all intents and purposes. The likeness was extraordinary, and had he not known that the real article was at Goring he would have been completely deceived himself.

The man waited till the door was closed: then he rose and stepped forward suspiciously.

"I don't know you," he said. "Who are you?"

"Since when has everyone employed by headquarters known one another?" Drummond returned