up a narrow winding stairway. Franz halted before a door in the second story. It was the last of the three doors in the hall. Muller took off his hat as the door opened and murmured a “good-evening.”
“There’s no one there; Mrs. Bernauer’s out.”
“Has she gone away, too?” asked the electrician hastily.
Franz did not notice that there was a slight change in the stranger’s voice at this question, and he answered calmly as ever: “Oh, no; she’s just driven to town. I think she went to see the doctor who lives quite a distance away. She hasn’t been feeling at all well. She took a cab to-day. I told her she ought to, as she wasn’t well enough to go by the tram. She ought to be home any moment now.”
“Well, I’ll hurry up with the job so that I’ll be out of the way when the lady comes,” said Muller, as Franz led him to the misbehaving bell.
It was in the wall immediately above a large table which filled the window niche so completely that there was but scant space left for the comfortable armchair that stood in front of it. The window was open and Muller leaned out, looking down at the garden below.
“What a fine old garden!” he exclaimed aloud. To himself he said: “This is the last window in the left wing. It is the window where Johann Knoll saw the red light.”
And when he turned back into the room again he found the source of this light right at his hand on the handsome old table at which Mrs. Bernauer evidently spent many of her hours. A row of books stood against the wall, framing the back of the table. Well-worn volumes of the classics among them gave proof that the one-time nurse was a woman of education. A sewing basket and neat piles of house linen, awaiting repairs, covered a large part of the table-top, and beside them stood a gracefully shaped lamp, covered by a shade of soft red silk.
It took Muller but a few seconds to see all this. Then he set about his investigation of the electric button. He unscrewed the plate and examined the wires meeting under it. While doing so he cast another glance at the table and saw a letter lying there, an open letter half out of its envelope. This envelope was of unusual shape, long and narrow, and
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