Theodore Drost, being one of Germany's foremost scientists, had been sent to England before the war, just as a number of others had been sent, as an advance guard of the Kaiser's Army which the German General Staff intended should eventually raid Great Britain. Truly, the foresight, patience, and thoroughness of the Hun had been astounding. The whole world's history contained nothing equal to the amazing craft and cunning displayed by those who were responsible for Germany's Secret Service--that service known to its agents under the designation of "Number Seventy, Berlin." It was fortunate that there was hardly a person in the whole of London who knew of the relationship between Stella Steele, the clever revue artiste, whose songs were the rage of all London and whose photographs were in all the shop-windows, and the venerable Dutch pastor. With his usual craft, Drost, knowing how thoroughly English was his daughter, had always posed to her as a great admirer of England and English ways. To judge by his protestations, he was a hater of the Kaiser and all his Satanic works. If, however, Ella--to give Stella her baptismal name--could have looked into that long, low attic, which her father always kept so securely locked, she would have been struck by the evil gloating of both men. Ortmann--whom she always held in suspicion--had conceived the plot a month ago--a foul and dastardly plot--and old Drost, as his paid catspaw, was about to put it into execution forthwith. Next night, just about half-past ten, Stella Steele gay, laughing, with one portion of her lithe body clothed in the smartest of ultra costumes by a famous French _couturiere_, the remainder of her figure either silk-encased or undraped, bounded off the stage of the popular theatre near Leicester Square, and fell into the arms of her grey-haired dresser. It was Saturday night, and the "house," packed to suffocation, were roaring applause. "Lights up!" shouted the stage-manager, and Stella, holding her breath and patting her hair, staggered against the scenery, half-fainting with exhaustion, and then, with a fierce effort, tripped merrily upon the stage and smilingly bowed to her appreciative and enthusiastic audience. The men in khaki, officers and "Tommies," roared for an encore. The revue had "caught on," and Stella Steele was the rage of London. Because she spoke and sang in French just as easily as she did in English, her new song, in what was really a very inane but tuneful revue--an up-to-date variation of musical comedy--had already been adopted in France as one of the marching songs of the French army. From paper-seller to Peer, from drayman to Duke: in the houses of Peckham and Park Lane, in Walworth and in Wick, the world hummed, sang, or drummed out upon pianos and pianolas that catchy chorus which ran: