"What happened was that I decided to continue Mr Tiel's journey for him. The arrest and so on had lost a day, but I knew that the night of your arrival was left open, and I had to risk it. That splash of salt water on your motor bike, and your resource in dodging pursuit, just saved the situation, and we arrived at the house on the same night."

"So that was why you were late!" exclaimed von Belke. "Fool that I was not to have questioned and suspected!"

"It might have been rather a nasty bunker," admitted Blacklock, "but luckily I got you to lose your temper with me when I reached that delicate part of my story, and you forgot to ask me."

"You always were a tactful fellow, Robin," murmured Phipps.

"Of course," resumed Blacklock, "I was in touch with certain people who advised me what scheme to recommend. My only suggestion was that the officer sent to advise us professionally should be one whose appearance might lead those who did not know him to suspect him capable of treasonable inclinations. My old friend, Captain Phipps——"

"Robin!" roared his old friend, "I read your bloomin' message. You asked for the best-looking officer on the staff, and the one with the nicest manners. Get on with your story!"

These interludes seemed to perplex their captive considerably.

"You got a pretended traitor? I see," he said gravely.

"Exactly. I tried you first with Ashington of the Haileybury—whom I slandered grossly by the way. If you had happened to know him by sight I should have passed on to another captain, till I got one you didn't know. Well, I needn't recall what happened at our council of war, but now we come to rather a——" he hesitated and glanced for an instant at Miss Holland,—"well, rather a delicate point in the story. I think it's only fair to those concerned to tell you pretty fully what happened. I believe I am right in thinking that they would like me to do so."

Again he glanced at the girl, and this time she gave a little assenting nod.