"If we need a witness, will you aid us?" asked Nelson.
"I will."
"Thank you," said Nelson, and left him one of the business cards he and Van Pelt had had printed.
On the corner he beckoned to his partner and told Van Pelt of what he had learned.
"We'll ask the elevated railroad gate-keeper below," said Van Pelt.
But at the station they got no satisfaction.
"I came on an hour ago," said the gate-keeper. "The other man has gone home."
"And you haven't seen 'em?" asked Nelson.
"No. The fact is, so many people come and go we hardly notice anybody."
"That is so," said George Van Pelt, as he and our hero walked away. "Nelson, I am afraid we are stumped."