London, been a missionary for some years in Sumatra, and, on more than one occasion, he had lectured upon the native life of that island. Therefore he had many friends among Dutch merchants and others, who all regarded him as a perfectly honest and even pious, if rather eccentric, man.

At times he wore big round horn-rimmed glasses which grossly magnified his eyes, giving him a strange goggled appearance. The world, however, never knew that Pastor Drost’s only daughter was that versatile dancer who, dressed in next-to-nothing, nightly charmed those huge enthusiastic audiences in the popular revue, “Half a Moment!”

Until three months after the outbreak of war Ella had regarded her father’s idiosyncrasies with some amusement, dismissing them as the outcome of a mind absorbed in chemical experiment, for though none save herself was aware of it, the long attic beneath the roof of her father’s house—the door of which Theodore Drost always kept securely locked—was fitted as a great chemical laboratory, where he, as a professor of chemistry, was constantly experimenting.

After the outbreak of war, by reason of a conversation she one day overheard between her father and his mysterious visitor, Ernst Ortmann, her suspicions had become aroused. Strange suspicions they indeed were. But in order to obtain confirmation of them, she had become more attached to her father, and had visited him far more frequently than before, busying herself in his domestic affairs, and sometimes assisting the old widow, Mrs Pennington, who acted as his single servant.

Two years prior to the war, happening upon that house, which was to be sold cheap, Ella had purchased it, ready furnished as it was, and given it as a present to her father as a place in which he might spend his old age in comfort. But until that night when she had overheard the curious conversation—which she had afterwards disclosed in confidence to her lover, Lieutenant Seymour Kennedy, Flight-Commander of the Naval Air Service—she had never dreamed that her father, the good and pious Dutchman who had once been a missionary, was an enemy alien, whose plans were maturing in order to assist a great and desperate conspiracy organised by the secret service of the German Fatherland.

On a certain well-remembered November evening she had revealed to Kennedy the truth, and they had both made a firm compact with each other. The plotter was her father, it was true. But she was a daughter of Great Britain, and it was for her to combat any wily and evil plot which might be formed against the land which had given 

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