They entered the house and found Mr. Cook seated in the
library alone.
"Did you deliver my note?" he asked.
"We did," replied Bob.
"Who came to the door?"
"Frank," and Bob related their experiences to his father. Mr. Cook was
much interested and puzzled by the manner in which Frank had acted when
he saw the drawing of the alligator on the back of the envelope.
"We thought perhaps it might be the sign of some secret society,"
said Hugh.
"Possibly so," agreed Mr. Cook. "Let's see; the same sign was on the
paper you found in the old house, Heinrich got a note with the
picture on it, and now this letter you picked up on the Wernbergs'
porch had it too."
"And the handwriting was the same as on that postal card you got this
morning," said Bob.
"I didn't see any picture on that though."
"No," agreed Bob. "Neither did I."
"I threw the card away," said Mr. Cook. "I was afraid your mother might
find it and worry."
"Perhaps there won't be any more trouble, now that Mr. Wernberg is out of
the way," suggested Bob.
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