I’d have you know. It’s true, he doesn’t look like much there, but that’s because he’s not in uniform. It makes such a difference.”      

       “Is the lady anything like her brother?” asked the detective indifferently, bending to examine the wiring.     

       “Oh, dear, no, not a bit; they’re as different as day and night. He’s only her half-brother anyway. She was the daughter of the Colonel’s second wife. Our Madam is the sweetest, gentlest lady you can imagine, an angel of goodness. But the Lieutenant here has always been a care to his family, they say. I guess he’s quieted down a bit now, for his father—he’s Colonel Leining, retired—made him get exchanged from the city to a small garrison town. There’s nothing much to do in Marburg, I dare say—well! you are a merry sort, aren’t you?” These last words, spoken in a tone of surprise, were called forth by a sudden sharp whistle from the detective, a whistle which went off into a few merry bars.     

       A sudden whistle like that from Muller’s lips was something that made the Imperial Police Force sit up and take notice, for it meant that things were happening, and that the happenings were likely to become exciting. It was a habit he could control only by the severest effort of the will, an effort which he kept for occasions when it was absolutely necessary. Here, alone with the harmless old man, he was not so much on his guard, and the sudden vibrating of every nerve at the word “Marburg,” found vent in the whistle which surprised old Franz. One young police commissioner with a fancy for metaphor had likened this sudden involuntary whistle of Muller’s to the bay of the hound when he strikes the trail; which was about what it was.     

       “Yes, I am merry sometimes,” he said with a laugh. “It’s a habit I have. Something occurred to me just then, something I had forgotten. Hope you don’t mind.”      

       “Oh, no, there’s no one here now, whistle all you like.”      

       But Muller’s whistle was not a continuous performance, and he had now completely mastered the excitation of his nerves which had called it forth. He threw another sharp look at the picture of the man who lived in Marburg, and then asked: “And now where is the button?”      

       “By the window there, beside the desk.” Franz 

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