to be a much finer, better man than the other individual, whose wrong at this particular criminal’s hand set in motion the machinery of justice. Several times that has happened to Muller, and each time his heart got the better of his professional instincts, of his practical common-sense, too, perhaps,... at least as far as his own advancement was concerned, and he warned the victim, defeating his own work. This peculiarity of Muller’s character caused his undoing at last, his official undoing that is, and compelled his retirement from the force. But his advice is often sought unofficially by the Department, and to those who know, Muller’s hand can be seen in the unravelling of many a famous case. The following stories are but a few of the many interesting cases that have come within the experience of this great detective. But they give a fair portrayal of Muller’s peculiar method of working, his looking on himself as merely an humble member of the Department, and the comedy of his acting under “official orders” when the Department is in reality following out his directions. THE CASE OF THE LAMP THAT WENT OUT CHAPTER I. THE DISCOVERY The radiance of a clear September morning lay over Vienna. The air was so pure that the sky shone in brightest azure even where the city’s buildings clustered thickest. On the outskirts of the town the rays of the awakening sun danced in crystalline ether and struck answering gleams from the dew on grass and shrub in the myriad gardens of the suburban streets. It was still very early. The old-fashioned steeple clock on the church of the Holy Virgin in Hietzing had boomed out six slow strokes but a short time back. Anna, the pretty blonde girl who carried out the milk for the dwellers in several streets of this aristocratic residential suburb, was just coming around the corner of the main street into a quiet lane. This lane could hardly be dignified by the name of street as yet, it was so very quiet. It had been opened and named scarcely a year back and it was bordered mostly by open gardens or fenced-in building lots. There were four houses in this street, two by two opposite each other, and another, an old-fashioned manor house, lying almost hidden in its great garden. But the quiet street