When it was ready Mr. Cook handed it to Bob, who at once started for the
Wernbergs' house, accompanied by Hugh. They discussed the recent turn of
events in the mystery and were somewhat at a loss as to what their next
move should be. Now that the old deserted house was a thing of the past
they did not know where to look for the seat of the conspiracy. They did
decide, however, that in so far as it was possible they would keep watch
on number twelve eighty-two Elm Street.
They mounted the front steps of the Wernbergs' house, and Bob advanced
toward the door bell. Before he rang it, however, he spied an envelope
lying at his feet, half concealed under the door mat. He stooped to pick
it up, and as he glanced at it he uttered an exclamation of surprise.
"Look, Hugh," he exclaimed.
The envelope was of plain white paper and addressed to Mr. Wernberg.
There was no street number on it, merely the name. This in itself was not
particularly odd, nor was it the cause of Bob's surprise. On the other
side of the envelope, however, was scrawled a drawing.
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