"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. "That night, after you left us, Mr Belke, Captain Phipps and I had a long discussion over a very knotty point. How were we to get you back again here after you had delivered your message to your submarine?" "I do not see exactly why you wished me to return?" said von Belke. "There were at least three vital reasons, In the first place some one you spoke to might have known too much about Tiel and have spotted the fraud. Then again, some one might easily have known the real Captain Ashington, and it would be a little difficult to describe Captain Phipps in such a way as to confound him with any one else. Finally, we wished to extract a little more information from you." Von Belke leapt from his seat with an exclamation. "What have I not told you!" he cried hoarsely. "Mein Gott, I had forgotten that! Give me that pistol! Come, give it to me! Why keep me alive?"