led the way with his candle.
“Why, how funny! What are those mirrors there for?” asked the electrician in a tone of surprise, pointing to two small mirrors hanging in the window niche. They were placed at a height and at such a peculiar angle that no one could possibly see his face in them.
“Something the master is experimenting with, I guess. He’s always making queer experiments; he knows a lot about scientific things.”
Muller shook his head as if in wonderment, and bent to investigate the button which was fastened into the wall beneath the window sill. His quick ear heard a carriage stopping in front of the house, and heard the closing of the front door a moment later. To facilitate his examination of the button, the detective had seated himself in the armchair which stood beside the desk. He half raised himself now to let the light of the candle fall more clearly on the wiring—then he started up altogether and threw a hasty glance at the mirrors above his head. A ray of light had suddenly flashed down upon him—a ray of red light, and it came reflected from the mirrors. Muller bit his lips to keep back the betraying whistle.
“What’s the matter?” asked the butler. “Did you drop anything?”
“Yes, the wooden rim of the button,” replied Muller, telling the truth this time. For he had held the little wooden circlet in his hands at the moment when the red light, reflected down from the mirrors, struck full upon his eyes. He had dropped it in his surprise and excitement. Franz found the little ring in the centre of the room where it had rolled, and the supposed electrician replaced it and rose to his feet, saying: “There, I’ve finished now.”
Franz did not recognise the double meaning in the words. “Yes, it’s all right! I’ve finished here now,” Muller repeated to himself. For now he knew beyond a doubt that the red light was a signal—and he knew also for whom this signal was intended. It was a signal for Herbert Thorne!—Herbert Thorne, whom no single thought or suspicion of Muller’s had yet connected with the murder of Leopold Winkler.
The detective was very much surprised and greatly excited. But Franz did not notice it, and indeed a far keener observer than the slow-witted old butler might have failed to see the sudden
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