We calculated that, finding he had been debited with three copies of the “plans,” whereas he actually received four, Easterbrook would calmly pocket one of them and return to the proper department the three for which he had signed. Events proved that we were right. In the afternoon, at the usual time, he left the office. Three minutes later we ascertained that the fourth copy of the “plans” was not in his desk. He had taken it with him, and it was easy to guess his purpose.
From that moment his doom was sealed. We could have arrested him at once, of course, but we wanted to know by what means those plans were to be dispatched to Germany. If we could only find that out one finger of the Hidden Hand would assuredly be lopped off for good.
On leaving the office Easterbrook made for a public telephone office, where, as it happened, three boxes stood side by side. As he entered the one, an agent of the Special Branch entered the one farthest from him. The boxes were of the threepence-in-the-slot pattern, and the trifling delay caused by dropping in the three pennies gave the detective his opportunity. Ringing up the operator at the Exchange, he demanded, in the name of the police, that Easterbrook’s conversation should be “tapped.” The operator promptly “plugged” him on to the line Easterbrook was using, so that he was able to listen, quite unknown to Easterbrook, to the conversation which followed.
“Is that 7257 North?” Easterbrook began. “I want to speak to Mr Huggon-Rose,” he went on. “That you, Rose? This is Easterbrook. Will you come down to Piccadilly and have some dinner with me? I am just arranging a yachting trip, and perhaps you would like to make one of the party. All right. Be at Scott’s at seven o’clock. Good-bye.” And he rang off.
Seven o’clock found Easterbrook and Huggon-Rose dining comfortably at Scott’s. Four men of the Special Branch, immaculately attired and apparently mere men-about-town, were seated at different tables near them. Easterbrook and his guest talked yachting ostentatiously, and many maps and papers were handed backward and forward. One of these, the lynx-eyed watchers noted, passed from Easterbrook to Huggon-Rose and was not returned. It was the confidential paper! Another link in our chain had been forged!
At half-past ten the two conspirators rose to leave. At the door of the restaurant they brushed past a man in seafaring dress, quite obviously a Dutch sailor, and, swiftly though it was done, one of our watchers saw a folded paper slip from Huggon-Rose’s hand into that of the Dutchman. He made off at once, closely shadowed by two of our men, while Easterbrook and Huggon-Rose walked away together, evidently looking for a taxicab, none too numerous at that hour.
Just as a cab drew up to the kerb I arrived on the scene. I had been kept closely informed of what was going on and had been waiting in a neighbouring restaurant in order to be present at the arrest of the two plotters. Incautiously I approached too near, and in the light of a street-lamp van Rosen caught sight of me. He recognised me instantly. With a snarl of rage he turned on me, and his hand shot to his hip-pocket. Then he recovered his self-possession and entered the taxi with Easterbrook. No doubt he reflected that a shot at me would not help him, and, it should be noted, neither man had any incriminating document on him. The “plans” were in possession of the Dutch sailor, and until they were secured we had to hold our hands. But one quarry was safe now.
The taxi soon deposited the two men at Easterbrook’s house, which was immediately closely surrounded. Half an hour later Madame Gabrielle, hatless and showing every sign of a struggle, slipped from a side door.
Breathlessly she explained that van Rosen, catching sight of her as he was going to his room on the first floor, had recognised her at once and had attacked her furiously. Why he did not shoot her I never could understand. Physically Madame Gabrielle was a match for him; she was a superb gymnast and in hard training, whereas van Rosen had been leading a dissipated life and was in thoroughly poor condition. A brief struggle had ended in Madame Gabrielle throwing him heavily by a simple wrestling trick, and, knowing that she must get away at all cost, she had rushed down the back stairway and got into the street.
A moment or two later a servant left the house and posted some letters in the pillar-box a few yards away. The letters were recovered later, and one of them, a postcard, was found to be addressed to Jules Cauvin. It was in a feminine handwriting, and bore neither the date nor the address of the writer. It read: