‘I don’t quite understand why you carry on so long with him,’ said Cary, who, though tired, could not but feel intense interest in the perfection of the police system and in the serene confidence of Dawson. The Yard could, it appeared, do unto the spies precisely what Dawson chose to direct. ‘Hagan is an American citizen,’ explained Dawson. ‘If he had been a British subject I would have taken him at Euston--we have full evidence of the burglary, and of the stolen papers in his suit-case. But as he is a damned unbenevolent neutral, and the American Government is very touchy, we must prove his intention to sell the papers to Germany. Then we can deal with him by secret court-martial, and President Wilson can go to blazes. The journey to Holland will prove this intention. Hagan has been most useful to us in Ireland, and now in the North of England and in Scotland, but he is too enterprising and too daring to be left any longer on the string. I will draw the ends together at the Hook.’ ‘I did not want to go to Holland,’ said Cary to me, when telling his story. ‘I was utterly sick and disgusted with the whole cold-blooded game of cat and mouse, but the police needed my evidence about the Notes and the burglary, and did not intend to let me slip out of their clutches. Dawson was very civil and pleasant, but I was in fact as tightly held upon his string as was the wretched Hagan. So I went on to Holland with that quick-change artist, and watched him come on board the steamer at Parkeston Quay, dressed as a rather German-looking commercial traveller, eager for war commissions upon smuggled goods. This sounds absurd, but his get-up seemed somehow to suggest the idea. Then I went below. Dawson always kept away from me whenever Hagan might have seen us together.’ The passage across to Holland was free from incident; there was no sign that we were at war, and Continental traffic was being carried serenely on, within easy striking distance of the German submarine base at Zeebrugge. The steamer had drawn in to the Hook beside the train, and Hagan was approaching the gangway, suit-case in hand. The man was on the edge of safety; once upon Dutch soil, Dawson could not have laid hands upon him. He would have been a neutral citizen in a neutral country, and no English warrant would run against him. But between Hagan and the gangway suddenly interposed the tall form of the ship’s captain; instantly the man was ringed about by officers, and before he could say a word or move a hand he was gripped hard and led across the deck to the steamer’s chart-house. Therein sat Dawson, the real, undisguised Dawson, and beside him sat Richard Cary. Hagan’s face, which two minutes earlier had been glowing with triumph and with the anticipation of German gold beyond the dreams of avarice, went white as chalk. He staggered and gasped as one stabbed to the heart, and dropped into a chair. His suit-case fell from his relaxed fingers to the floor.