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. ...] Reprint of the detective novel starring Joseph Muller, Secret Service detective of the Imperial Austrian police.