And the three conspirators--men who were working so secretly, yet with such dastardly intent in the enemy's cause--laughed as they helped themselves to cigars from the big silver box. Nearly three weeks passed when, one day while Seymour Kennedy was sitting in Ella's pretty little drawing-room, he accidentally noticed the artistic blue-and-white vase, and remarking how unusual was the shape, his beloved related how it had come into her possession. Kennedy reflected for a few seconds, his brows knit in deep thought. "Curious that your father desired to match a vase like this! With what object, I wonder?" "He told me that he wanted it for a friend." "H'm! I wonder why his friend was so eager to match it?" was the air-pilot's remark. "And, again, why did he send you to buy it, when his friend could surely have done so?" Ella was silent. That question had never occurred to her. "I wonder if your father is making some fresh experiment? Have you been to the laboratory lately?" he inquired. "No, dear." "A secret visit there might be worth while," he suggested. "Meanwhile, the question of this vase excites my curiosity considerably. I can't help thinking that Ortmann is at the bottom of some other vile trickery. Their failure to kill Merton Mansfield has, no doubt, made them all the more determined to deal an effective _coup_." Some five days later it was announced in the London papers that Mr Merton Mansfield, the man in whom Great Britain placed her principal trust in securing victory, would, on the following Thursday, address a mass meeting of the munition workers in the great Midland town of G--. The object of the meeting was to urge greater enthusiasm in the prosecution of the war, and to induce the workers, in the national cause, to forego their holidays and thus keep up the output of heavy shells and high-explosives. Seymour Kennedy, who was in the mess at the time, read the paragraph, and then sat pondering. Next day he induced his commanding officer to give him leave, and he was soon in London making active inquiries. He found that Mr Merton Mansfield had been compelled to decline the invitation of Lord Heatherdale, and had arranged to stay the night at the Central Station Hotel at G--, as he would have to return to London by the first train next morning. Mr Merton Mansfield was an extremely busy man. No member of the Cabinet held greater responsibility upon his shoulders, and certainly no man held higher and stronger views of British patriotism. Any words from his lips were listened to eagerly, and carefully weighed, not only here, but in neutral countries also. Hence, at this great meeting he was expected to reveal one or two matters of paramount interest, and also make a further declaration of British policy. On the Tuesday night--two days before the meeting--Flight-Commander Kennedy slept at the Central Hotel in G--and next morning returned to London.